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Table 2 Comparison of pregnancy and post-natal characteristics for control and intervention participants included in the intention-to-treat analysis

From: Portable HEPA filter air cleaner use during pregnancy and children’s behavior problem scores: a secondary analysis of the UGAAR randomized controlled trial

Characteristic

n (%)

Control (n = 233)

Intervention (n = 245)

Median (25th, 75th percentile) or n (%)

Median (25th, 75th percentile) or n (%)

Maternal blood lead concentration in late pregnancy ug/dL

375 (78)

1.5 (1.2, 1.8)

1.4 (1.2, 1.9)

 Missing, n (%)

103 (22)

61 (26)

42 (17)

Type of birth

 Cesarean

174 (36)

86 (37)

88 (36)

 Vaginal

285 (60)

134 (57)

151 (62)

 Missing, n (%)

19 (4)

13 (6)

6 (2)

Preterm birth

 Preterm (< 37 weeks)

31 (7)

10 (4)

21 (9)

 Full tern (≥ 37 weeks)

428 (89)

210 (90)

218 (88)

 Missing, n (%)

19 (4)

13 (6)

6 (3)

Birth weight, grams

458 (96)

3450 (3125, 3800)

3550 (3200, 3800)

 Missing, n (%)

19 (4)

13 (6)

6 (2)

Child’s sex

 Female

220 (46)

110 (47)

110 (45)

 Male

239 (50)

111 (48)

128 (52)

 Missing, n (%)

19 (4)

13 (5)

6 (3)

Child’s blood lead concentration at age 2, ug/dL

328 (69)

2.6 (1.9, 3.6)

2.5 (1.7, 3.5)

 Missing, n (%)

150 (31)

80 (46)

70 (45)

Maternal depression level (BDI) at 2-year visit

 Mild

369 (77)

168 (72)

201 (82)

 Moderate to severe

31 (6)

8 (4)

13 (5)

 Missing, n (%)

88 (18)

57 (24)

31 (13)

Maternal WASI matrix reasoning raw score

387 (81)

16 (12, 19)

17 (13, 19)

 Missing, n (%)

91 (19)

58 (25)

33 (13)

Maternal WASI vocabulary raw score

387 (81)

36 (32, 40)

36 (32, 40)

 Missing, n (%)

91 (19)

58 (25)

33 (13)

  1. BDI Beck Depression Inventory-II, WASI Wechsler Abbreviated Scale of Intelligence