Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
Search terms
For CINAHL (1981- October 17th 2012 ) LIMIT: humans
1. Caesarean section
2. Caesarean sections
3. Cesarean section
4. Cesarean sections
5. Delivery, abdominal
6. Deliveries, abdominal
7. Abdominal delivery
8. Abdominal deliveries
9. C-section
10. C-sections
11. C section
12. C sections
13. Postcesarean section
14. Postcaesarean section
15. Caesarean delivery
16. Cesarean delivery
17. Delivery, Caesarean
18. Delivery, Cesarean
19. Mode of delivery
20. [#1 or #2 or #3 or #4 or #5 or #6 or #7 or #8 or #9 or #10 or #11 or #12 or
#13 or #14 or #15 or #16 or #17 or #18 or #19]
21. Birth interval
22. Birth intervals
23. Birth spacing
24. Birth spacings
25. Pregnancy interval
26. Pregnancy intervals
27. First birth interval
28. First birth intervals
29. Inter delivery interval
30. Inter delivery intervals
31. Inter-delivery interval
32. Inter-delivery intervals
33. Between pregnancy interval
34. Between pregnancy intervals
35. Inter pregnancy interval
36. Inter pregnancy intervals
37. Inter-pregnancy interval
38. Inter-pregnancy intervals
39. Subsequent pregnancy interval
40. Subsequent pregnancy intervals
41. Pregnancy spacing
42. Pregnancy spacings
43. Pregnancy gap
44. Pregnancy gaps
45. First birth spacing
46. First birth spacings
47. Timing between pregnancy
48. Inter gestational time
49. [#21 or #22 or #23 or #24 or #25 or #26 or #27 or #28 or #29 or #30 or
#31 or #32 or #33 or #34 or #35 or #36 or #37 or #38 or #39 or #40 or
#41 or #42 or #43 or #44 or #45 or #46 or #47 or #48]
No of records returned
3351
728
8690
841
106
17
106
17
1023
325
3365
1008
12
3
975
3518
975
3518
2213
17332
168
185
36
0
95
34
12
4
1484
3288
1484
3288
13
1
3
5
3
5
1
3686
12
0
18
9
1
2
3
1836
9591
1
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
71.
72.
73.
74.
[#20 and #49]
Article
Cohort study
Case control study
Systematic review
Review
Retrospective study
Prospective study
Cross sectional study
[#51 or #52 or #53 or #54 or #55 or #56 or #57]
Female
Woman
Human
Longterm effects
Long-term effects
Long-term complications
Longterm complications
Pregnancy outcome
Postoperative complications
Subfertility
Sub-fertility
Subsequent fertility
Secondary subfertility
[#59 or #60 or #61 or #62 or #63 or #64 or #65 or #66 or #67 or #68]
[#20 and #49 and #58 and #69]
1229
118753
17449
6109
18084
155756
13539
26128
302320
30
3796
1118
13
1337
18764
230
11
34
2
25121
2049
2
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
Search terms
For PubMed (1966- October 17th 2012 ) LIMIT: humans
1. Caesarean section
2. Caesarean sections
3. Cesarean section
4. Cesarean sections
5. Delivery, abdominal
6. Deliveries, abdominal
7. Abdominal delivery
8. Abdominal deliveries
9. C-section
10. C-sections
11. C section
12. C sections
13. Postcesarean section
14. Postcaesarean section
15. Caesarean delivery
16. Cesarean delivery
17. Delivery, Caesarean
18. Delivery, Cesarean
19. Mode of delivery
20. [#1 or #2 or #3 or #4 or #5 or #6 or #7 or #8 or #9 or #10 or #11 or #12 or
#13 or #14 or #15 or #16 or #17 or #18 or #19]
21. Birth interval
22. Birth intervals
23. Birth spacing
24. Birth spacings
25. Pregnancy interval
26. Pregnancy intervals
27. First birth interval
28. First birth intervals
29. Inter delivery interval
30. Inter delivery intervals
31. Inter-delivery interval
32. Inter-delivery intervals
33. Between pregnancy interval
34. Between pregnancy intervals
35. Inter pregnancy interval
36. Inter pregnancy intervals
37. Inter-pregnancy interval
38. Inter-pregnancy intervals
39. Subsequent pregnancy interval
40. Subsequent pregnancy intervals
41. Pregnancy spacing
42. Pregnancy spacings
43. Pregnancy gap
44. Pregnancy gaps
45. First birth spacing
46. First birth spacings
47. Timing between pregnancy
48. Inter gestational time
49. [#21 or #22 or #23 or #24 or #25 or #26 or #27 or #28 or #29 or #30 or
No of records returned
36773
34515
36773
34514
36016
33860
36016
33860
33724
33618
33724
33618
33600
15
35754
35737
8845
33403
5451
45797
13899
5313
5584
5315
19875
9882
7720
5313
55
30
1
55
19875
9882
145
110
27
19
1299
594
428
3
889
586
209
2
3778
79
32179
3
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
71.
72.
73.
74.
#31 or #32 or #33 or #34 or #35 or #36 or #37 or #38 or #39 or #40 or
#41 or #42 or #43 or #44 or #45 or #46 or #47 or #48]
[#20 and #49]
Article
Cohort study
Case control study
Systematic review
Review
Retrospective study
Prospective study
Cross sectional study
[#51 or #52 or #53 or #54 or #55 or #56 or #57]
Female
Woman
Human
Longterm effects
Long-term effects
Long-term complications
Longterm complications
Pregnancy outcome
Postoperative complications
Subfertility
Sub-fertility
Subsequent fertility
Secondary subfertility
[#59 or #60 or #61 or #62 or #63 or #64 or #65 or #66 or #67 or #68]
[#20 and #49 and #58 and #69]
3458
10965986
1162626
567715
1438238
1669141
428389
388037
11026029
1519582
1604867
90443
1324
68444
392802
50969
50732
1791
2051
2032274
2378
4
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
Search terms
For Medline (1966- October 17th 2012 ) LIMIT: humans
1. Caesarean section
2. Caesarean sections
3. Cesarean section
4. Cesarean sections
5. Delivery, abdominal
6. Deliveries, abdominal
7. Abdominal delivery
8. Abdominal deliveries
9. C-section
10. C-sections
11. C section
12. C sections
13. Postcesarean section
14. Postcaesarean section
15. Caesarean delivery
16. Cesarean delivery
17. Delivery, Caesarean
18. Delivery, Cesarean
19. Mode of delivery
20. [#1 or #2 or #3 or #4 or #5 or #6 or #7 or #8 or #9 or #10 or #11 or #12 or
#13 or #14 or #15 or #16 or #17 or #18 or #19]
21. Birth interval
22. Birth intervals
23. Birth spacing
24. Birth spacings
25. Pregnancy interval
26. Pregnancy intervals
27. First birth interval
28. First birth intervals
29. Inter delivery interval
30. Inter delivery intervals
31. Inter-delivery interval
32. Inter-delivery intervals
33. Between pregnancy interval
34. Between pregnancy intervals
35. Inter pregnancy interval
36. Inter pregnancy intervals
37. Inter-pregnancy interval
38. Inter-pregnancy intervals
39. Subsequent pregnancy interval
40. Subsequent pregnancy intervals
41. Pregnancy spacing
42. Pregnancy spacings
43. Pregnancy gap
44. Pregnancy gaps
45. First birth spacing
46. First birth spacings
47. Timing between pregnancy
48. Inter gestational time
49. [#21 or #22 or #23 or #24 or #25 or #26 or #27 or #28 or #29 or #30 or
No of records returned
11360
1544
38613
3337
3825
500
3825
500
469
148
28491
14287
246
16
5497
17044
5497
17044
6649
93997
11475
6960
1047
4
18332
10344
3366
2156
78
52
1
1
9934
4933
145
124
30
21
1319
703
652
3
1387
685
230
2
1894
87
38445
5
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
#31 or #32 or #33 or #34 or #35 or #36 or #37 or #38 or #39 or #40 or
#41 or #42 or #43 or #44 or #45 or #46 or #47 or #48]
[#20 and #49]
Article
Cohort study
Case control study
Systematic review
Review
Retrospective study
Prospective study
[#51 or #52 or #53 or #54 or #55 or #56 or #57]
Longterm effects
Long-term effects
Long-term complications
Longterm complications
Pregnancy outcome
Postoperative complications
Subfertility
Sub-fertility
Subsequent fertility
Secondary subfertility
[#59 or #60 or #61 or #62 or #63 or #64 or #65 or #66 or #67 or #68]
[#20 and #49 and #58 and #69]
3369
329145
161878
141390
45784
948279
249597
292088
1865932
2385
177486
92492
1378
71444
332025
1896
99
4074
115
617920
2366
6
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
Search terms
For Embase (1974- October 17th 2012 ) LIMIT: humans
1. Caesarean section
2. Caesarean sections
3. Cesarean section
4. Cesarean sections
5. Delivery, abdominal
6. Deliveries, abdominal
7. Abdominal delivery
8. Abdominal deliveries
9. C-section
10. C-sections
11. C section
12. C sections
13. Postcesarean section
14. Postcaesarean section
15. Caesarean delivery
16. Cesarean delivery
17. Delivery, Caesarean
18. Delivery, Cesarean
19. Mode of delivery
20. [#1 or #2 or #3 or #4 or #5 or #6 or #7 or #8 or #9 or #10 or #11 or #12 or
#13 or #14 or #15 or #16 or #17 or #18 or #19]
21. Birth interval
22. Birth intervals
23. Birth spacing
24. Birth spacings
25. Pregnancy interval
26. Pregnancy intervals
27. First birth interval
28. First birth intervals
29. Inter delivery interval
30. Inter delivery intervals
31. Inter-delivery interval
32. Inter-delivery intervals
33. Between pregnancy interval
34. Between pregnancy intervals
35. Inter pregnancy interval
36. Inter pregnancy intervals
37. Inter-pregnancy interval
38. Inter-pregnancy intervals
39. Subsequent pregnancy interval
40. Subsequent pregnancy intervals
41. Pregnancy spacing
42. Pregnancy spacings
43. Pregnancy gap
44. Pregnancy gaps
45. First birth spacing
46. First birth spacings
47. Timing between pregnancy
48. Inter gestational time
49. [#21 or #22 or #23 or #24 or #25 or #26 or #27 or #28 or #29 or #30 or
No of records returned
15706
2182
56415
4720
129898
1282
129898
1282
786
221
169945
57320
303
27
14945
55647
14945
55647
19064
399408
18287
7518
945
5
24399
9918
5111
2308
514
276
4
1
13074
4766
224
145
42
19
1617
608
648
2
1685
913
185
2
2450
118
47605
7
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
#31 or #32 or #33 or #34 or #35 or #36 or #37 or #38 or #39 or #40 or
#41 or #42 or #43 or #44 or #45 or #46 or #47 or #48]
[#20 and #49]
Article
Cohort study
Case control study
Systematic review
Review
Retrospective study
Prospective study
[#51 or #52 or #53 or #54 or #55 or #56 or #57]
Longterm effects
Long-term effects
Long-term complications
Longterm complications
Pregnancy outcome
Postoperative complications
Subfertility
Sub-fertility
Subsequent fertility
Secondary subfertility
[#59 or #60 or #61 or #62 or #63 or #64 or #65 or #66 or #67 or #68]
[#20 and #49 and #58 and #69]
5057
24423441
257876
361495
97255
2531587
398595
427866
24463385
2485
177237
110216
1283
92962
158278
3584
177
7643
197
489387
2181
8
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
Search terms
For Web of Knowledge (1945- October 17th 2012 ) LIMIT: humans
1. Caesarean section
2. Caesarean sections
3. Cesarean section
4. Cesarean sections
5. Delivery, abdominal
6. Deliveries, abdominal
7. Abdominal delivery
8. Abdominal deliveries
9. C-section
10. C-sections
11. C section
12. C sections
13. Postcesarean section
14. Postcaesarean section
15. Caesarean delivery
16. Cesarean delivery
17. Delivery, Caesarean
18. Delivery, Cesarean
19. Mode of delivery
20. [#1 or #2 or #3 or #4 or #5 or #6 or #7 or #8 or #9 or #10 or #11 or #12 or
#13 or #14 or #15 or #16 or #17 or #18 or #19]
21. Birth interval
22. Birth intervals
23. Birth spacing
24. Birth spacings
25. Pregnancy interval
26. Pregnancy intervals
27. First birth interval
28. First birth intervals
29. Inter delivery interval
30. Inter delivery intervals
31. Inter-delivery interval
32. Inter-delivery intervals
33. Between pregnancy interval
34. Between pregnancy intervals
35. Inter pregnancy interval
36. Inter pregnancy intervals
37. Inter-pregnancy interval
38. Inter-pregnancy intervals
39. Subsequent pregnancy interval
40. Subsequent pregnancy intervals
41. Pregnancy spacing
42. Pregnancy spacings
43. Pregnancy gap
44. Pregnancy gaps
45. First birth spacing
46. First birth spacings
47. Timing between pregnancy
48. Inter gestational time
49. [#21 or #22 or #23 or #24 or #25 or #26 or #27 or #28 or #29 or #30 or
No of records returned
81129
81162
81654
81654
9112
9112
9112
9112
964
964
170655
170655
397
21
46392
46591
46367
46591
19883
278985
42184
42184
7204
1436
50852
50823
12684
12693
189
189
4
4
26594
26576
330
330
73
73
3789
3789
7714
817
3472
3470
1114
294
54280
137
134583
9
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
#31 or #32 or #33 or #34 or #35 or #36 or #37 or #38 or #39 or #40 or
#41 or #42 or #43 or #44 or #45 or #46 or #47 or #48]
[#20 and #49]
Article
Cohort study
Case control study
Systematic review
Review
Retrospective study
Prospective study
[#51 or #52 or #53 or #54 or #55 or #56 or #57]
Longterm effects
Long-term effects
Long-term complications
Longterm complications
Pregnancy outcome
Postoperative complications
Subfertility
Sub-fertility
Subsequent fertility
Secondary subfertility
[#59 or #60 or #61 or #62 or #63 or #64 or #65 or #66 or #67 or #68]
[#20 and #49 and #58 and #69]
10513
1112937
502390
656134
131986
2686271
661545
776823
5426753
7547
524065
162792
2482
144619
432355
5123
185
10597
172
1180789
2955
10
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
Search terms
For Scopus (1960- October 17th 2012 ) LIMIT: humans
1. Caesarean section
2. Caesarean sections
3. Cesarean section
4. Cesarean sections
5. Delivery, abdominal
6. Deliveries, abdominal
7. Abdominal delivery
8. Abdominal deliveries
9. C-section
10. C-sections
11. C section
12. C sections
13. Postcesarean section
14. Postcaesarean section
15. Caesarean delivery
16. Cesarean delivery
17. Delivery, Caesarean
18. Delivery, Cesarean
19. Mode of delivery
20. [#1 or #2 or #3 or #4 or #5 or #6 or #7 or #8 or #9 or #10 or #11 or #12 or
#13 or #14 or #15 or #16 or #17 or #18 or #19]
21. Birth interval
22. Birth intervals
23. Birth spacing
24. Birth spacings
25. Pregnancy interval
26. Pregnancy intervals
27. First birth interval
28. First birth intervals
29. Inter delivery interval
30. Inter delivery intervals
31. Inter-delivery interval
32. Inter-delivery intervals
33. Between pregnancy interval
34. Between pregnancy intervals
35. Inter pregnancy interval
36. Inter pregnancy intervals
37. Inter-pregnancy interval
38. Inter-pregnancy intervals
39. Subsequent pregnancy interval
40. Subsequent pregnancy intervals
41. Pregnancy spacing
42. Pregnancy spacings
43. Pregnancy gap
44. Pregnancy gaps
45. First birth spacing
46. First birth spacings
47. Timing between pregnancy
48. Inter gestational time
49. [#21 or #22 or #23 or #24 or #25 or #26 or #27 or #28 or #29 or #30 or
No of records returned
26209
14301
56642
56642
6977
6977
6977
6977
1017
1017
205902
205902
311
25
7530
26903
7530
26903
13043
19095205
20985
20985
1334
1334
30730
30730
6317
6317
173
173
4
4
15421
15421
282
282
44
44
2072
2072
820
820
2495
2495
292
292
6219
138
8577583
11
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
#31 or #32 or #33 or #34 or #35 or #36 or #37 or #38 or #39 or #40 or
#41 or #42 or #43 or #44 or #45 or #46 or #47 or #48]
[#20 and #49]
Article
Cohort study
Case control study
Systematic review
Review
Retrospective study
Prospective study
[#51 or #52 or #53 or #54 or #55 or #56 or #57]
Longterm effects
Long-term effects
Long-term complications
Longterm complications
Pregnancy outcome
Postoperative complications
Subfertility
Sub-fertility
Subsequent fertility
Secondary subfertility
[#59 or #60 or #61 or #62 or #63 or #64 or #65 or #66 or #67 or #68]
[#20 and #49 and #58 and #69]
32559
16809245
267456
391139
92060
2829705
504987
469519
2367013
4381
259403
76694
1712
101416
416857
3300
149
4500
167
2538971
554
12
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
Search terms
For The Cochrane Library (1993- October 17th 2012 ) LIMIT: humans
1. Caesarean section
2. Caesarean sections
3. Cesarean section
4. Cesarean sections
5. Delivery, abdominal
6. Deliveries, abdominal
7. Abdominal delivery
8. Abdominal deliveries
9. C-section
10. C-sections
11. C section
12. C sections
13. Postcesarean section
14. Postcaesarean section
15. Caesarean delivery
16. Cesarean delivery
17. Delivery, Caesarean
18. Delivery, Cesarean
19. Mode of delivery
20. [#1 or #2 or #3 or #4 or #5 or #6 or #7 or #8 or #9 or #10 or #11 or #12 or
#13 or #14 or #15 or #16 or #17 or #18 or #19]
21. Birth interval
22. Birth intervals
23. Birth spacing
24. Birth spacings
25. Pregnancy interval
26. Pregnancy intervals
27. First birth interval
28. First birth intervals
29. Inter delivery interval
30. Inter delivery intervals
31. Inter-delivery interval
32. Inter-delivery intervals
33. Between pregnancy interval
34. Between pregnancy intervals
35. Inter pregnancy interval
36. Inter pregnancy intervals
37. Inter-pregnancy interval
38. Inter-pregnancy intervals
39. Subsequent pregnancy interval
40. Subsequent pregnancy intervals
41. Pregnancy spacing
42. Pregnancy spacings
43. Pregnancy gap
44. Pregnancy gaps
45. First birth spacing
46. First birth spacings
47. Timing between pregnancy
48. Inter gestational time
49. [#21 or #22 or #23 or #24 or #25 or #26 or #27 or #28 or #29 or #30 or
No of records returned
2171
1582
3413
3413
251
251
251
251
33
33
469
469
29
3
602
1450
602
1450
696
5936
3996
3996
414
0
4740
4740
3452
3452
304
304
0
0
3544
3544
250
250
4
4
1068
1068
444
0
221
221
392
0
4752
64
9367
13
Additional file 1: Strategies to search CINAHL, the Cochrane Library, Embase, MEDLINE, PubMed,
Scopus and Web of Knowledge to identify cohort and case–control studies to determine the
association between mode of delivery and inter-pregnancy interval
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
#31 or #32 or #33 or #34 or #35 or #36 or #37 or #38 or #39 or #40 or
#41 or #42 or #43 or #44 or #45 or #46 or #47 or #48]
[#20 and #49]
Article
Cohort study
Case control study
Systematic review
Review
Retrospective study
Prospective study
[#51 or #52 or #53 or #54 or #55 or #56 or #57]
Longterm effects
Long-term effects
Long-term complications
Longterm complications
Pregnancy outcome
Postoperative complications
Subfertility
Sub-fertility
Subsequent fertility
Secondary subfertility
[#59 or #60 or #61 or #62 or #63 or #64 or #65 or #66 or #67 or #68]
[#20 and #49 and #58 and #69]
1644
731959
18545
54726
30101
113702
12135
96203
731959
6597
29911
1558
9716
10044
21463
361
28
363
228
59971
1175
14