| Allergic group | Control group | χ2 | P value | ||
---|---|---|---|---|---|---|
Number | Ratio (%) | Number | Ratio (%) | |||
Age | ||||||
  < 35 | 1026 | 85.5 | 3872 | 85.6 | 0.004 | 0.952 |
  ≥ 35 | 174 | 14.5 | 653 | 14.4 | ||
Ethnic group | ||||||
  Han | 1150 | 95.8 | 4273 | 94.4 | 3.733 | 0.053 |
  Minority | 50 | 4.2 | 252 | 5.6 | ||
Pre-existing allergies of pregnant women | ||||||
  Yes | 563 | 46.9 | 820 | 18.1 | 429.241 | 0.000 |
  No | 637 | 53.1 | 3705 | 81.9 | ||
Pre-existing allergies of their fathers | ||||||
  Yes | 141 | 11.8 | 229 | 5.1 | 70.167 | 0.000 |
  No | 1059 | 88.2 | 4296 | 94.9 | ||
Pre-existing allergies of their mothers | ||||||
  Yes | 138 | 11.5 | 252 | 5.6 | 52.556 | 0.000 |
  No | 1062 | 88.5 | 4273 | 94.4 | ||
Carpet | ||||||
  Yes | 121 | 10.1 | 454 | 10.0 | 0.003 | 0.959 |
  No | 1079 | 89.9 | 4071 | 90.0 | ||
Heating facilities | ||||||
  Heating radiator | 176 | 14.7 | 630 | 13.9 | 2.151 | 0.341 |
  Air-conditioner | 757 | 63.1 | 2799 | 61.9 | ||
  Stove | 267 | 22.2 | 1096 | 24.2 | ||
Ventilation | ||||||
  Yes | 106 | 8.8 | 436 | 9.6 | 0.712 | 0.399 |
  No | 1094 | 91.2 | 4089 | 90.4 | ||
Cooking fuel use | ||||||
  Yes | 790 | 65.8 | 2874 | 63.5 | 2.215 | 0.137 |
  No | 410 | 34.2 | 1651 | 36.5 | ||
Home humidity | ||||||
  Moist | 12 | 1.0 | 58 | 1.3 | 1.030 | 0.597 |
  Moderate | 966 | 80.5 | 3668 | 81.1 | ||
  Dry | 222 | 18.5 | 799 | 17.6 | ||
Decorations | ||||||
  < Half a year | 27 | 2.3 | 68 | 1.5 | 6.042 | 0.049 |
  Half a year ~  < Two years | 269 | 22.4 | 922 | 20.4 | ||
  ≥ Two years | 904 | 75.3 | 3535 | 78.1 | ||
Pets contacting | ||||||
  Never | 993 | 82.8 | 3859 | 85.3 | 5.064 | 0.167 |
  Occasional contact (1–2 times / month) | 120 | 10.0 | 401 | 8.9 | ||
  Frequent contact (not close) | 63 | 5.3 | 192 | 4.2 | ||
  Close contact (daily contact) | 24 | 2.0 | 73 | 1.6 | ||
Planting | ||||||
  Yes | 712 | 59.3 | 2576 | 56.9 | 2.244 | 0.134 |
  No | 488 | 40.7 | 1949 | 43.1 | ||
Plush toys | ||||||
  Yes | 262 | 21.8 | 842 | 18.6 | 6.340 | 0.012 |
  No | 938 | 78.2 | 3683 | 81.4 | ||
Disinfectants | ||||||
  Yes | 167 | 13.9 | 434 | 9.6 | 18.887 | 0.000 |
  No | 1033 | 86.1 | 4091 | 90.4 | ||
Mosquito repellents | ||||||
  Yes | 70 | 5.8 | 260 | 5.7 | 0.013 | 0.908 |
  No | 1130 | 94.2 | 4265 | 94.3 | ||
Insecticides | ||||||
  Yes | 15 | 1.25 | 30 | 0.7 | 4.191 | 0.041 |
  No | 1185 | 98.75 | 4495 | 99.3 | ||
Air fresheners | ||||||
  Yes | 37 | 3.1 | 138 | 3.0 | 0.004 | 0.952 |
  No | 1163 | 96.9 | 4387 | 97.0 | ||
Smoking | ||||||
  Yes | 993 | 82.75 | 3796 | 83.9 | 0.901 | 0.343 |
  No | 207 | 17.25 | 729 | 16.1 | ||
Drinking | ||||||
  Yes | 62 | 5.2 | 220 | 4.9 | 0.187 | 0.655 |
  No | 1138 | 94.8 | 4304 | 95.1 | ||
Antihistamines | ||||||
  Yes | 11 | 0.9 | 19 | 0.4 | 4.490 | 0.034 |
  No | 1189 | 99.1 | 4506 | 99.6 | ||
Antibiotics | ||||||
  Yes | 33 | 2.75 | 86 | 1.9 | 3.362 | 0.067 |
  No | 1167 | 97.25 | 4439 | 98.1 | ||
Glucocorticoids | ||||||
  Yes | 18 | 1.5 | 22 | 0.5 | 14.051 | 0.000 |
  No | 1182 | 98.5 | 4503 | 99.5 | ||
Antipyretic analgesics | ||||||
  Yes | 32 | 2.7 | 62 | 1.4 | 9.872 | 0.002 |
  No | 1168 | 97.3 | 4463 | 98.6 | ||
Tocolytic agent | ||||||
  Yes | 422 | 35.2 | 1414 | 31.2 | 6.684 | 0.010 |
  No | 778 | 64.8 | 3111 | 68.8 | ||
Probiotics | ||||||
  Yes | 89 | 7.4 | 236 | 5.2 | 8.583 | 0.003 |
  No | 1111 | 92.6 | 4289 | 94.8 | ||
Depression grading | ||||||
  Normal | 332 | 27.7 | 1438 | 31.8 | 11.040 | 0.026 |
  Mild | 673 | 56.1 | 2340 | 51.7 | ||
  Moderate | 156 | 13.0 | 580 | 12.8 | ||
  Less severe | 28 | 2.3 | 137 | 3.0 | ||
  Severe | 11 | 0.9 | 30 | 0.7 | ||
Anxiety grading | ||||||
  Normal | 712 | 59.3 | 2932 | 64.8 | 12.392 | 0.006 |
  Mild | 416 | 34.7 | 1357 | 30.0 | ||
  Moderate | 62 | 5.2 | 199 | 4.4 | ||
  Severe | 10 | 0.8 | 36 | 0.8 | ||
Pre-BMI | ||||||
  18.5 ~ 23.9(Normal weight) | 846 | 70.5 | 3100 | 68.5 | 1.939 | 0.379 |
  < 18.5(Underweight) | 181 | 15.1 | 747 | 16.5 | ||
  24 ~ 28(Overweight) | 127 | 10.6 | 520 | 11.5 | ||
  > 28(Obesity) | 46 | 3.8 | 158 | 3.5 |