Table 1 Distributions of select characteristics in cases and control subjects
From: Tag SNPs in complement receptor-1 contribute to the susceptibility to non-small cell lung cancer
Variables |    Cases (n = 470) |    Controls (n = 470) |  | ||
|---|---|---|---|---|---|
No | (%) | No | (%) | P a | |
   Sex |  |  |  |  | 0.832 |
   Male | 324 | 68.9 | 328 | 69.8 |  |
   Female | 146 | 31.1 | 142 | 30.2 |  |
   Age |  |  |  |  | 0.470 |
   <50 | 84 | 17.9 | 96 | 20.4 |  |
   50-59 | 177 | 37.7 | 187 | 39.8 |  |
   60-69 | 129 | 27.4 | 111 | 23.6 |  |
   ≥70 | 80 | 17.0 | 76 | 16.2 |  |
   Smoking status |  |  |  |  | 0.321 |
   Non-smoker | 265 | 56.4 | 281 | 59.8 |  |
   Smoker | 205 | 43.6 | 189 | 40.2 |  |
   Pack-year smoked |  |  |  |  | 0.001 |
   <25 | 75 | 36.6 | 96 | 50.8 |  |
   ≥25 | 130 | 63.4 | 93 | 49.2 |  |