Table 1.
NO2 | Benzene | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
N | Mean | SD | Minimum | Maximum | p Value* | N | Mean | SD | Minimum | Maximum | p Value* | |
Residential zone | ||||||||||||
Town centre | 356 | 25.01 | 5.40 | 8.30 | 39.06 | <0.001 | 356 | 2.43 | 1.29 | 0.34 | 7.91 | <0.001 |
Residential zone | 35 | 18.91 | 7.10 | 8.08 | 30.52 | 35 | 2.13 | 1.36 | 0.47 | 5.58 | ||
Countryside | 39 | 14.94 | 6.61 | 7.56 | 35.82 | 39 | 1.34 | 1.08 | 0.04 | 4.26 | ||
Residential building age | ||||||||||||
<5 | 94 | 22.14 | 6.17 | 9.09 | 38.27 | 0.001 | 94 | 2.65 | 1.53 | 0.51 | 6.76 | 0.109 |
5–14 | 67 | 22.67 | 7.14 | 9.56 | 37.89 | 67 | 2.44 | 1.41 | 0.04 | 5.76 | ||
15–29 | 66 | 24.79 | 5.75 | 8.30 | 39.06 | 66 | 2.20 | 1.24 | 0.34 | 7.91 | ||
>29 | 160 | 24.68 | 6.03 | 7.56 | 37.30 | 160 | 2.13 | 1.11 | 0.19 | 5.97 | ||
Missings | 43 | 43 | ||||||||||
Participant's age | ||||||||||||
<25 | 21 | 21.48 | 7.54 | 8.30 | 32.95 | 0.503 | 21 | 1.84 | 1.21 | 0.34 | 5.76 | 0.055 |
25–29 | 117 | 23.61 | 6.20 | 8.68 | 36.88 | 117 | 2.10 | 1.12 | 0.45 | 5.80 | ||
30–34 | 183 | 23.98 | 6.45 | 8.30 | 38.27 | 183 | 2.37 | 1.36 | 0.05 | 6.76 | ||
35+ | 109 | 23.36 | 6.68 | 7.56 | 39.06 | 109 | 2.51 | 1.42 | 0.04 | 7.91 | ||
Country of birth | ||||||||||||
Spain | 413 | 23.57 | 6.42 | 7.56 | 39.06 | 0.409 | 413 | 2.31 | 1.33 | 0.04 | 7.91 | 0.893 |
Other | 17 | 24.42 | 8.37 | 8.08 | 36.88 | 17 | 2.18 | 0.89 | 0.97 | 4.83 | ||
Education | ||||||||||||
Primary | 80 | 23.29 | 6.24 | 8.30 | 34.58 | 0.793 | 80 | 2.26 | 1.21 | 0.34 | 5.76 | 0.117 |
Secondary | 194 | 23.49 | 6.88 | 7.56 | 38.27 | 194 | 2.19 | 1.31 | 0.19 | 7.91 | ||
University | 156 | 23.90 | 6.16 | 8.08 | 39.06 | 156 | 2.47 | 1.36 | 0.04 | 6.76 | ||
Social class (SC, mother) | ||||||||||||
SCI+II | 92 | 23.96 | 6.18 | 8.05 | 39.06 | 0.949 | 92 | 2.45 | 1.28 | 0.45 | 5.32 | 0.026 |
SCIII | 90 | 23.02 | 7.26 | 7.56 | 34.50 | 90 | 2.06 | 1.38 | 0.04 | 7.91 | ||
SCIV+V | 247 | 23.67 | 6.34 | 8.30 | 38.27 | 247 | 2.33 | 1.30 | 0.19 | 6.76 | ||
Missings | 1 | 1 | ||||||||||
Working status (third term) | ||||||||||||
Yes | 106 | 24.43 | 6.18 | 8.68 | 37.89 | 0.132 | 106 | 2.43 | 1.25 | 0.04 | 5.97 | 0.126 |
No | 298 | 23.33 | 6.59 | 7.56 | 39.06 | 298 | 2.27 | 1.33 | 0.05 | 7.91 | ||
Missings | 26 | 26 | ||||||||||
Parity | ||||||||||||
Primiparous | 262 | 23.83 | 6.35 | 8.05 | 39.06 | 0.524 | 262 | 2.36 | 1.29 | 0.34 | 6.76 | 0.175 |
Multiparous | 168 | 23.24 | 6.73 | 7.56 | 37.78 | 168 | 2.22 | 1.36 | 0.04 | 7.91 | ||
Smoking | ||||||||||||
Never smoking | 204 | 23.09 | 6.54 | 7.56 | 38.27 | 0.196 | 204 | 2.30 | 1.28 | 0.04 | 5.97 | 0.022 |
No smoking during pregnancy | 129 | 24.67 | 5.94 | 10.24 | 39.06 | 129 | 2.47 | 1.40 | 0.05 | 7.91 | ||
Smoking but not after 12th week | 2 | 27.13 | 0.37 | 26.87 | 27.39 | 2 | 4.18 | 0.18 | 4.05 | 4.31 | ||
Smoking after 12th week | 69 | 23.12 | 7.23 | 8.30 | 37.78 | 69 | 1.98 | 1.15 | 0.34 | 5.76 | ||
Missings | 26 | 26 | ||||||||||
Season of last menstruation | ||||||||||||
Winter | 122 | 22.72 | 6.04 | 8.30 | 36.88 | 0.014 | 122 | 2.27 | 1.31 | 0.38 | 5.80 | 0.108 |
Spring | 95 | 24.04 | 6.89 | 8.52 | 39.06 | 95 | 2.55 | 1.39 | 0.19 | 6.76 | ||
Summer | 93 | 24.99 | 6.36 | 8.46 | 37.78 | 93 | 2.11 | 1.31 | 0.05 | 7.91 | ||
Autumn | 120 | 23.07 | 6.61 | 7.56 | 38.27 | 120 | 2.30 | 1.25 | 0.04 | 5.97 |
*Kruskal-Wallis or Mann-Whitney test.