Table 1 The selected characteristics between laryngeal carcinoma cases and controls used for association study
From: NBS1 rs2735383 polymorphism is associated with an increased risk of laryngeal carcinoma
|  | Cases(n = 342) | Controls(n = 345) | P a |
|---|---|---|---|
N (%) | N (%) | ||
Sex | |||
 Male | 333(97.368) | 334(96.812) | 0.664 |
 Female | 9(2.632) | 11(3.188) |  |
Age(years) | |||
 <30 | 1(0.292) | 2(0.580) | 0.864 |
 30–59 | 150(43.860) | 154(44.638) |  |
 60–89 | 191(55.848) | 188(54.492) |  |
  ≥ 90 | 0(0.000) | 1(0.290) |  |
Ethnicity | |||
 Han | 231(67.544) | 238(68.986) | 0.685 |
 Zhuang | 111(32.456) | 107(31.014) |  |
Smoking status | |||
 ever | 223(65.205) | 196(56.812) | 0.024 |
 never | 119(34.795) | 149(43.188) |  |
Drinking status | |||
 ever | 176(51.462) | 100(28.986) | 0.000 |
 never | 166(48.538) | 245(71.014) |  |
Classification of diagnosis | |||
 poorly differentiated squamous cell carcinoma | 37(10.819) |  |  |
 Moderately differentiated squamous cell carcinoma | 63(18.421) |  |  |
 well-differentiated squamous cell carcinoma | 76(22.222) |  |  |
 Unknown | 166(48.538) |  |  |