Table 2 Selected lifestyle characteristics of two sub-study subjects
From: The effect of pre-pregnancy hair dye exposure on infant birth weight: a nested case-control study
Exposure variables | LBW group (n = 315) | Macrosomia group (n = 381) | ||||
|---|---|---|---|---|---|---|
LBW (%) | NBW (%) | P a | Macrosomia (%) | NBW (%) | P a | |
N | 105 | 210 | Â | 127 | 254 | Â |
Nearby chemical factory | Â | Â | 0.303 | Â | Â | 0.934 |
 Yes | 4 (3.8) | 14 (6.7) |  | 4 (3.2) | 10 (3.9) |  |
Recent interior decoration | Â | Â | 0.279 | Â | Â | 0.374 |
 Yes | 13 (12.5) | 36 (17.2) |  | 18 (14.2) | 28 (11.0) |  |
Regularly cooking | Â | Â | 0.806 | Â | Â | 0.094 |
 Yes | 76 (72.4) | 154 (73.3) |  | 97 (76.4) | 173 (68.1) |  |
Chief fuel used for cooking | Â | Â | 0.989 | Â | Â | 0.920 |
 Pollution-type | 11 (10.6) | 22 (10.5) |  | 15 (11.8) | 29 (11.5) |  |
 Ecological and clean-type | 93 (89.4) | 187 (89.5) |  | 112 (88.2) | 224 (88.5) |  |
Use of range hood | Â | Â | 0.285 | Â | Â | 0.876 |
 Yes | 72 (68.6) | 156 (74.3) |  | 88 (69.3) | 174 (68.5) |  |
Pets | Â | Â | 0.584 | Â | Â | 0.731 |
 Yes | 29 (27.6) | 52 (24.8) |  | 28 (22.0) | 60 (23.6) |  |
Radiation-proof clothes use during pregnancy | Â | Â | 0.978 | Â | Â | 1.000 |
 Yes | 11 (10.6) | 22 (10.5) |  | 15(11.8) | 30 (11.8) |  |
Lipstick use during pregnancy | Â | Â | 0.717 | Â | Â | 0.054 |
 Yes | 6 (5.7) | 10 (4.8) |  | 2 (1.6) | 15 (5.9) |  |
Hair dye use pre-pregnancy | Â | Â | 0.047 | Â | Â | 0.175 |
 Yes | 75 (71.4) | 126 (60.0) |  | 75 (59.1) | 168 (66.1) |  |