Table 1 Characteristics of the women in relation to ELF-MF parameters
From: Prenatal exposure to extremely low frequency magnetic field and its impact on fetal growth
Characteristics | N | Median (Q1, Q3)(mG) | ||
|---|---|---|---|---|
TWA | P50 | P75 | ||
Total | 128 | 0.63 (0.38,1.09) | 0.38 (0.23,0.68) | 0.63 (0.38,1.17) |
Maternal age at child birth (years) | ||||
<25 | 14 | 0.45 (0.28,0.63)* | 0.36 (0.18,0.48) | 0.50 (0.33,0.68)* |
25–30 | 79 | 0.64 (0.38,1.04) | 0.38 (0.23,0.63) | 0.63 (0.38,1.17) |
> 30 | 35 | 0.71 (0.45,1.49) | 0.48 (0.23,0.82) | 0.82 (0.38,1.52) |
Maternal BMI before pregnancy (kg/m2) | ||||
<18.5 | 28 | 0.64 (0.41,1.11) | 0.41 (0.28,0.70) | 0.66 (0.41,1.15) |
18.5–24 | 93 | 0.58 (0.37,1.04) | 0.38 (0.18,0.63) | 0.57 (0.33,1.17) |
> 24 | 7 | 1.22 (0.39,1.53) | 0.82 (0.23,0.97) | 1.13 (0.48,1.52) |
Maternal education level | ||||
Middle school and below | 7 | 0.66 (0.58,0.90) | 0.38 (0.33,0.48) | 0.57 (0.57,0.77) |
High school | 15 | 0.75 (0.35,1.56) | 0.43 (0.18,0.77) | 0.68 (0.33,1.73) |
College and undergraduate | 96 | 0.64 (0.39,1.10) | 0.43 (0.23,0.72) | 0.66 (0.38,1.17) |
Postgraduate and above | 10 | 0.33 (0.23,0.80) | 0.21 (0.13,0.52) | 0.33 (0.23,0.88) |
Maternal employment | ||||
Manual labor | 84 | 0.64 (0.38,1.06) | 0.43 (0.23,0.70) | 0.66 (0.38,1.17) |
Mental labor | 30 | 0.49 (0.37,0.90) | 0.36 (0.23,0.52) | 0.55 (0.43,0.88) |
Others | 14 | 0.79 (0.57,1.36) | 0.56 (0.33,1.17) | 0.88 (0.57,1.52) |
Average family income / month*person (RMB) | ||||
< 4000 | 28 | 0.70 (0.44,1.40) | 0.48 (0.28,0.80) | 0.70 (0.43,1.68) |
4000~10,000 | 75 | 0.58 (0.38,1.07) | 0.38 (0.23,0.63) | 0.63 (0.38,1.13) |
> 10,000~ | 24 | 0.64 (0.32,1.05) | 0.31 (0.18,0.62) | 0.67 (0.38,1.33) |
Maternal passive smoking | ||||
Yes | 56 | 0.53 (0.37,0.88) | 0.36 (0.21,0.68) | 0.52 (0.36,1.03) |
No | 69 | 0.67 (0.40,1.10) | 0.43 (0.23,0.63) | 0.77 (0.43,1.48) |
Parity | ||||
1 | 111 | 0.63 (0.38,1.10) | 0.43 (0.23,0.68) | 0.63 (0.38,1.17) |
≥ 2 | 17 | 0.69 (0.25,1.08) | 0.33 (0.18,0.63) | 0.57 (0.33,1.17) |
Infant sex | ||||
Male | 64 | 0.65 (0.40,1.29) | 0.40 (0.25,0.79) | 0.72 (0.40,1.52) |
Female | 64 | 0.54 (0.37,0.89) | 0.38 (0.20,0.65) | 0.57 (0.38,0.93) |