1. Context
2. Evidence Acquisition
2.1. Data Sources
2.2. Search Strategy
2.3. Inclusion and Exclusion Criteria
2.4. Qualitative Evaluation
2.5. Data Extraction
2.6. Statistical Analysis
3. Results
3.1. Literature Search Results
3.2. Characteristics of Studies Included in the Systematic Review
| Ref | First Author | Place | Year of Study | Sample Size | Age (Mean ± SD) | Trimester of Pregnancy | Questionnaire | Prevalence of Depression (%) |
|---|---|---|---|---|---|---|---|---|
| (15) | Bazarganipour F. | Aran va Bidgol | 2008 | 200 | 25.89 ± 5.5 | First | Beck | 41 |
| (16) | Garrusi B. | Kerman | 2012 | 255 | 29.1 ± 6.4 | All | Beck | 30 |
| (17) | Bondad R. | Mashhad | 2001 | 320 | 24.5 ± 0.9 | Third | Beck | 57.8 |
| (18) | laloee A. | Tehran | 2005 | 400 | 26.4 ± 4.9 | All | Beck | 21.3 |
| (19) | Najafi F. | Tehran | 2015 | 2721 | 28.4 ± 6.12 | Third | DSSA21a | 50.7 |
| (20) | Ghasemi A. | Tehran | 2002 | 1452 | 25.3 ± 6 | All | SCL-90Rb | 10.5 |
| (21) | Modabernia M. | Rasht | 2007 | 415 | Third | Beck | 25 | |
| (22) | Parsaie Rad E. | Ahvaz | 2009 | 70 | Third | Beck | 33.3 | |
| (23) | Nazari H. | Khorramabad | 2011 | 280 | 26.7 ± 6.0 | All | GHQc | 11.8 |
| (24) | Moshki M. | Gonabab | 2014 | 208 | 26.89 ± 4.5 | Third | Edinburghd | 30 |
| (25) | Shahmiri H. | Zanjan | 2004 | 300 | 26.2 ± 4.31 | All | Zung | 32 |
| (26) | Amanat S. | Isfahan | 2005 | 600 | All | Beck | 28.7 | |
| (27) | Ranjbar M | Bonab | 2015 | 125 | 24.4 ± 4.5 | All | EPDS | 56 |
| (28) | Mardanihamule M. | Shahin Shahr | 2009 | 315 | Third | GHQ | 16 | |
| (29) | Moeinimehr M. | Isfahan | 2010 | 966 | All | PHQe | 70.1 | |
| (30) | Karbakhsh M. | Tehran | 2001 | 170 | All | Beck | 30.6 | |
| (31) | Pazande F. | Tehran | 1999 | 260 | Third | Beck | 40 | |
| (31) | Pazande F. | Tehran | 1999 | 143 | Second | Beck | 45.5 | |
| (31) | Pazande F. | Tehran | 1999 | 173 | First | Beck | 54.3 | |
| (32) | Omidvar S. | Babol | 2006 | 191 | All | Beck | 28.8 | |
| (33) | Shabangiz A. | Isfahan | 2013 | 378 | Third | Beck | 65.2 | |
| (34) | Baghi V. | Saqez | 2012 | 140 | 27.4 ± 5.3 | Second and Third | EPDS | 32.9 |
| (35) | Salmalian H. | Babol | 2006 | 263 | 25.6 ± 4.8 | First and Second | Beck | 59.3 |
| (36) | Hosaynisazi F. | Tehran | 2003 | 180 | 26.14 ± 7.4 | Third | Beck | 49.4 |
| (37) | Iranfar S. | Kermanshah | 2003 | 163 | Third | Beck | 53.4 | |
| (38) | Ehsanpour S. | Isfahan | 2011 | 404 | Third | Beck | 26.7 | |
| (39) | Rezaee R. | Babol | 2012 | 47 | Second | DSSA21 | 31.9 | |
| (39) | Rezaee R. | Babol | 2012 | 47 | First | DSSA21 | 42.5 | |
| (39) | Rezaee R. | Babol | 2012 | 48 | Third | DSSA21 | 72.9 | |
| (40) | Kheirabadi G. R. | Isfahan | 2007 | 1898 | Third | Beck | 88.7 | |
| (41) | Mosalanezhad L. | Jahrom | 2006 | 214 | Third | Scl-90R | 42 | |
| (42) | Sotoudeh G. | Tehran | 2000 | 55 | All | Beck | 20.2 | |
| (43) | Hadavi M. | Rafsanjan | 2003 | 350 | Third | Beck | 43.4 | |
| (44) | Balouchi A. | Zabol | 2015 | 110 | All | GHQ | 45 | |
| (45) | Shahhosseini Z. | Sari | 2009 | 428 | Second | EPDS | 26.2 | |
| (46) | Hejrati P. | Hamedan | 2010 | 197 | Second | EPDS | 49.7 | |
| (47) | Jamali S. | Jahrom | 2016 | 264 | First | Beck | 61.7 | |
| (47) | Jamali S. | Jahrom | 2016 | 342 | Second | Beck | 71.6 | |
| (47) | Jamali S. | Jahrom | 2016 | 491 | Third | Beck | 75.5 | |
| (48) | Delavari M. | Tabriz | 2016 | 287 | Third | EPDS | 15.7 |
a Depression anxiety stress scales- 21
b Symptom checklist-90-revised
c General health questionnaire
d Edinburgh postnatal depression scale
e Patient health questionnaire
3.3. Total Prevalence of Depression
3.4. Subgroup Analysis Based on Geographical Region
3.5. Subgroup Analysis Based on Questionnaires
| Variable | Studies (N) | Sample (N) | Heterogeneity | 95% CI | Prevalence (%) | |
|---|---|---|---|---|---|---|
| I2 | P-Value | |||||
| Regions | ||||||
| Center | 17 | 10615 | 99.24 | < 0.001 | 27.67 - 53.11 | 39.69 |
| East | 3 | 638 | 94.74 | < 0.001 | 27.36 - 62.14 | 44.02 |
| North | 9 | 1851 | 95.77 | < 0.001 | 26.80 - 50.98 | 38.16 |
| South | 7 | 1986 | 97.31 | < 0.001 | 37.32 - 65.78 | 51.69 |
| West | 4 | 780 | 96.87 | < 0.001 | 17.38 - 56.67 | 34.41 |
| Test for subgroup differences | Q = 2.71, df (Q) = 4, P = 0.608 | |||||
| Questionnaires | ||||||
| Beck | 23 | 7985 | 98.60 | < 0.001 | 35.47 - 56.60 | 45.84 |
| SCL - 90R | 2 | 1666 | 99.20 | < 0.001 | 4.65 - 63.36 | 22.51 |
| DSSA21 | 4 | 2863 | 81.60 | 0.001 | 36.87 - 62.48 | 49.65 |
| GHQ | 3 | 705 | 96.20 | < 0.001 | 8.97 - 43.32 | 21.53 |
| EPDS | 6 | 1385 | 94.85 | < 0.001 | 23.03 - 46.32 | 33.68 |
| Zung | 1 | 300 | 0 | - | 26.97 - 37.49 | 32.00 |
| PHQ - 9 | 1 | 966 | 0 | - | 67.14 - 72.90 | 70.10 |
| Test for subgroup differences | Q = 165.08, df(Q)=6, P < 0.001 | |||||
| Trimester | ||||||
| First | 4 | 684 | 85.99 | < 0.001 | 39.91 - 61.08 | 50.52 |
| Second | 5 | 1157 | 97.33 | < 0.001 | 26.92 - 64.42 | 44.96 |
| Third | 17 | 8722 | 98.82 | < 0.001 | 36.64 - 60.20 | 48.33 |
| All | 12 | 5307 | 98.60 | < 0.001 | 20.83 - 43.61 | 30.83 |
| Test for subgroup differences | Q = 5.96, df (Q)=3, P = 0.113 | |||||
Abbreviations: CI, Confidence interval; N, Number.




