Table 1 Comparison of baseline characteristics for control and intervention participants included in the intention-to-treat analysis
Characteristic | n (%) | Control (n = 233) | Intervention (n = 245) |
|---|---|---|---|
Median (25th, 75th percentile) or n (%) | Median (25th, 75th percentile) or n (%) | ||
Season of enrollment | |||
Winter (Dec, Jan, Feb) | 151 (32) | 77 (33) | 74 (30) |
Spring (Mar, Apr, May) | 138 (29) | 73 (31) | 65 (27) |
Summer (Jun, July, Aug) | 56 (12) | 24 (11) | 32 (13) |
Fall (Sep, Oct, Nov) | 133 (28) | 59 (25) | 74 (30) |
Gestational age, wk | 478 (100) | 10 (9, 12) | 11 (9, 13) |
Maternal age, yr | 478 (100) | 28 (25, 33) | 29 (25, 33) |
Monthly household income, Tugriks | |||
≥ 800,000 | 376 (79) | 182 (78) | 194 (79) |
< 800,000 | 93 (19) | 46 (20) | 47 (19) |
Not reported, n (%) | 9 (2) | 5 (2) | 4 (2) |
Maternal marital status | |||
Married | 282 (59) | 135 (58) | 147 (60) |
Engaged/Common-law | 180 (38) | 88 (38) | 92 (38) |
Single | 10 (2) | 7 (3) | 3 (1) |
Not reported, n (%) | 6 (1) | 3 (1) | 3 (1) |
Maternal education | |||
Completed university | 383 (80) | 187 (80) | 196 (80) |
Less than university | 60 (13) | 31 (13) | 29 (12) |
Not reported, n (%) | 35 (7) | 15 (6) | 20 (8) |
Lived with a smoker baseline | |||
No | 248 (52) | 120 (52) | 128 (52) |
Yes | 218 (46) | 107 (46) | 111 (45) |
Not reported, n (%) | 12 (3) | 6 (3) | 6 (2) |
Maternal pre-pregnancy BMI, kg/m2 | 449 (94) | 21.7 (19.6, 23.9) | 21.4 (19.7, 24.0) |
Not reported, n (%) | 29 (6) | 21 (9) | 8 (3) |
Paternal age, yr | 453 (95) | 31 (26, 35) | 30 (26, 35) |
Not reported, n (%) | 25 (5) | 9 (4) | 16 (7) |
Paternal education | |||
Completed university | 364 (76) | 179 (77) | 185 (76) |
Less than university | 85 (18) | 45 (19) | 40 (16) |
Not reported, n (%) | 29 (6) | 9 (4) | 20 (8) |