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Table 1 The characteristics of participants

From: A behavioral strategy to minimize air pollution exposure in pregnant women: a randomized controlled trial

  All Intervention (N = 53) Control (N = 51)  
   Mean (SD) No. (%) Mean (SD) No. (%) P
Age 27.11 (4.10) 27.37 (3.96)   27.02 (4.96)   0.67a
Gestational age 22.92 (8.09) 23.48 (8.83)   22.29 (8.79)   0.49a
Pregnancy order       0.82a
The first 77 (71.6)   40 (75.5)   38 (72.5)  
The second or more 26 (28.4)   13 (24.5)   14 (27.5)  
Education       0.42b
≤Secondary 65 (62.6)   31 (58.5)   34 (66.7)  
> Higher 39 (37.4)   22 (41.5)   17 (33.3)  
Husband's education       0.15b
≤ Secondary 68 (65.4)   31 (58.5)   37 (72.5)  
> Higher 36 (34.5)   22 (41.5)   14 (27.5)  
Income       0.41b
Poor 15 (14.5)   6 (11.3)   9 (17.6)  
Fair/good 89 (85.5)   47 (88.7)   42 (82.4)  
  1. aDerived from t-test
  2. bDerived from chi-square