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Table 1 Comparison of demographic data in the intervention and control group

From: A randomized controlled trial of vitamin D supplementation on perinatal depression: in Iranian pregnant mothers

Variables Vitamin D Control p-value
Age (year) Mean ± sd 26.40 ± 4.88 26.22 ± 4.33 0.80
Job N (%)    0.96
 Housewife 72 (96) 75 (96.2)  
 Employed 3 (4) 3 (3.8)
Education N (%)    0.55
 High school 26 (34.7) 21 (26.9)  
 High school diploma 34 (45.3) 38 (48.7)
 University 15 (20.0) 19 (24.4)
Parity    0.17
 Nullipara 41 (54.7) 51 (65.4)  
 Multipara 34 (45.3) 27 (34.6)
Using others supplements    0.017
 Yes 55 (73.3) 69 (88.5)  
 No 20 (26.7) 9 (11.5)
Planned pregnancy    0.01
 Yes 55 (73.3) 69 (88.5)  
 No 20 (26.7) 9 (11.5)
Seasonal distribution in onset N (%)    0.32
 Autumn 9 (12) 6 (7.7)  
 Winter 11 (14.7) 7 (9)
 Spring 55 (73.3) 65 (83.3)
Sun exposure(minutes)    0.55
  < 15 14 (21.9) 12 (16.7)  
 15–30 28(43.8) 33 (45.8)
 30–60 10 (15.6) 17 (23.6)
  > 60 12 (18.8) 10 (13.9)