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Table 1 Descriptive statistics of the participants

From: The association between air pollution and preterm birth and low birth weight in Guangdong, China

  Experimental group Control group χ 2 p
N % N %
Agea 912.29 0.38
 20~25 350 25.38 368 26.82   
 26~30 690 50.04 674 49.13   
 31~35 237 17.19 239 17.42   
 36~40 73 5.29 60 4.37   
 41~49 29 2.10 31 2.26   
Educationa 13.67 0.85
 Primary school and below 20 1.71 18 1.59   
 Junior high school 271 23.20 319 28.21   
 Senior high school 286 24.49 283 25.02   
 College 526 45.03 473 41.82   
 Postgraduate and above 65 5.57 38 3.36   
Occupationa 39.95 0.52
 Farmer 249 22.02 266 24.01   
 Worker 223 19.72 259 23.38   
 Service industry 111 9.81 102 9.21   
 Business 41 3.63 47 4.24   
 Housework 33 2.92 23 2.08   
 Teacher/Civil servant 395 34.92 323 29.18   
 Others 79 6.98 88 7.94   
Registered residencea 1.19 0.28
 Rural 845 60.97 912 66.23   
 Urban 541 39.03 465 33.77   
  1. Note: a Variables with missing data