Table 1 Frequency distributions of demographics in studied subjects
Variables | NSCLC case-control study | PN case-control study | ||||
|---|---|---|---|---|---|---|
Case, n (%) | Control, n (%) | Pa | Malignant, n (%) | Benign, n (%) | Pa | |
No. of subjects | 210 | 245 | Â | 131 | 61 | Â |
Gender | ||||||
  Male | 156(74.3) | 173(70.6) | 0.383 | 65(49.6) | 36(59.0) | 0.225 |
  Female | 54(25.7) | 72(29.4) |  | 66(50.4) | 25(41.0) |  |
Age (years) | ||||||
  >60 | 109(51.9) | 121(49.4) | 0.592 | 70(53.4) | 16(26.2) | < 0.001 |
  ≤60 | 101(48.1) | 124(50.6) |  | 61(46.6) | 45(73.8) |  |
Smoking status | ||||||
  Ever | 105(50.0) | 88(35.9) | 0.002 | 37(28.2) | 15(24.6) | 0.596 |
  Never | 105(50.0) | 157(64.1) |  | 94(71.8) | 46(75.4) |  |
Stages | ||||||
  LS | 32(15.3) |  |  |  |  |  |
  RDS | 158(75.2) |  |  |  |  |  |
  Undetermined | 20(9.5) |  |  |  |  |  |
Histological type | ||||||
  LUSC | 97(46.2) |  |  | 6(4.6) |  |  |
  LUAD | 81(38.6) |  |  | 113(86.3) |  |  |
  Other/unknown | 32(15.2) |  |  | 12(9.1) |  |  |
Maximum diameter | ||||||
  < 10 mm |  |  |  | 45(34.4) | 48(78.7) | < 0.001 |
  10–20 mm |  |  |  | 57(43.5) | 12(19.7) |  |
  > 20–30 mm |  |  |  | 29(22.1) | 1(1.6) |  |