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Table 1 Comparisons of basic characteristics of included participants and total participants

From: The effect of perceived social support during early pregnancy on depressive symptoms at 6 weeks postpartum: a prospective study

 Included (n = 2546)Total (n = 3299)P *
Mean ± SD
 Age (years)28.8 ± 3.829.0 ± 3.70.04
 BMI (kg/m2) a21.4 ± 3.021.5 ± 3.60.53
N (%)
Ethnicity  0.57
 Han2515 (99.0)3243 (98.8) 
 Others26 (1.0)40 (1.2) 
Economic status  0.94
 Difficult/careful/loan306 (12.3)373 (12.2) 
 Fair1747 (70.0)2125 (69.6) 
 Good444 (17.8)554 (18.2) 
Education (years)  0.66
  ≤ 12258 (10.2)314 (9.6) 
 12–151970 (77.5)2546 (77.6) 
  > 15313 (12.3)422 (12.9) 
Parity b  0.40
 Nulliparous2138 (84.0)2760 (83.7) 
 Parous408 (16.0)539 (16.3) 
Health status  0.83
 Fair/poor/very poor578 (22.8)729 (23.4) 
 Good1530 (60.3)1869 (60.0) 
 Very good429 (16.9)515 (16.5) 
Sleep quality  0.68
 Fair/poor/very poor1292 (50.8)1602 (51.4) 
 Good/very good1250 (49.2)1514 (48.6) 
Smoking  1
 No2530 (99.7)3255 (99.7) 
 Yes8 (0.3)10 (0.3) 
Alcohol use  1
 No523 (90.8)2311 (90.9) 
 Yes53 (9.2)231 (9.1) 
  1. * t-test for continuous variables, chi-square test for categorical variables
  2. a BMI: body mass index calculated by height and weight
  3. b: except parity variable are complete, missing data of others does not count in cells