Table 3.
Descriptive data of the participants
| Variables | Non-nasopharyngeal carcinoma cases (n=520,743) | Nasopharyngeal carcinoma cases (n=355) | P value |
| PM2.5 (μg/m3) | |||
| PM2.5<30.42 | 165,634 (31.81%) | 110 (30.99%) | 0.260 |
| 30.42≤PM2.5<32.71 | 87,233 (16.75%) | 47 (13.24%) | |
| 32.71≤PM2.5<40.35 | 142,273 (27.32%) | 104 (29.3%) | |
| PM2.5≥40.35 | 125,603 (24.12%) | 94 (26.48%) | |
| PM10 (μg/m3) | |||
| PM10<50.66 | 130,770 (25.11%) | 64 (18.03%) | 0.019* |
| 50.66≤PM10<58.89 | 118,457 (22.75%) | 84 (23.66%) | |
| 58.89≤PM10<70.23 | 146,439 (28.12%) | 113 (31.83%) | |
| PM10≥70.23 | 125,077 (24.02%) | 94 (26.48%) | |
| PM10-2.5 (μg/m3) | |||
| PM10-2.5<20.44 | 122,658 (23.55%) | 59 (16.62%) | 0.018* |
| 20.44≤PM10-2.5<24.08 | 138,620 (26.62%) | 103 (29.01%) | |
| 24.08≤PM10-2.5<29.27 | 126,679 (24.33%) | 89 (25.07%) | |
| PM10-2.5≥29.27 | 132,786 (25.5%) | 104 (29.3%) | |
| SO2 (ppb) | |||
| SO2<3.65 | 131,457 (25.24%) | 76 (21.41%) | 0.151 |
| 3.65≤SO2<4.63 | 124,313 (23.87%) | 77 (21.69%) | |
| 4.63≤SO2<5.81 | 133,527 (25.64%) | 102 (28.73%) | |
| SO2≥5.81 | 131,446 (25.24%) | 100 (28.17%) | |
| NOx (ppb) | |||
| NOx<20.50 | 127,602 (24.5%) | 73 (20.56%) | 0.047* |
| 20.50≤NOx<27.25 | 130,325 (25.03%) | 91 (25.63%) | |
| 27.25≤NOx<32.80 | 134,522 (25.83%) | 83 (23.38%) | |
| NOx≥32.80 | 128,294 (24.64%) | 108 (30.42%) | |
| O3 (ppb) | |||
| O3<25.71 | 128,955 (24.76%) | 93 (26.2%) | 0.300 |
| 25.71≤O3<27.64 | 124,633 (23.93%) | 97 (27.32%) | |
| 27.64≤O3<30.19 | 139,920 (26.87%) | 88 (24.79%) | |
| O3≥30.19 | 127,235 (24.43%) | 77 (21.69%) | |
| CO (ppm) | |||
| CO<0.47 | 125,976 (24.19%) | 77 (21.69%) | 0.111 |
| 0.47≤CO<0.57 | 125,414 (24.08%) | 86 (24.23%) | |
| 0.57≤CO<0.71 | 138,495 (26.6%) | 84 (23.66%) | |
| CO≥0.71 | 130,858 (25.13%) | 108 (30.42%) | |
| Age (years) | |||
| 30≤Age<40 | 115,635 (22.21%) | 80 (22.54%) | <0.001* |
| 40≤Age<50 | 139,232 (26.74%) | 119 (33.52%) | |
| 50≤Age<60 | 121,312 (23.3%) | 99 (27.89%) | |
| 60≤Age<70 | 144,564 (27.76%) | 57 (16.06%) | |
| BMI (Kg/m2) | |||
| BMI<18.5 | 12,853 (2.47%) | 12 (3.38%) | 0.025* |
| 18.5≤BMI<24 | 193,008 (37.06%) | 155 (43.66%) | |
| 24≤BMI<27 | 179,161 (34.40%) | 113 (31.83%) | |
| BMI≥27 | 135,721 (26.06%) | 75 (21.13%) | |
| Smoking | |||
| Never | 395,746 (76.00%) | 283 (79.72%) | 0.218 |
| Occasional | 24,675 (4.74%) | 19 (5.35%) | |
| Average <1 pack/day | 67,793 (13.02%) | 35 (9.86%) | |
| Average >1 pack/day | 32,529 (6.25%) | 18 (5.07%) | |
| Drinking | |||
| Never | 375,072 (72.03%) | 279 (78.59%) | 0.022* |
| Occasional | 117,233 (22.51%) | 62 (17.46%) | |
| Frequent | 28,438 (5.46%) | 14 (3.94%) | |
| Betel chewing | |||
| Never | 481,688 (92.50%) | 333 (93.80%) | 0.444 |
| Occasional | 24,553 (4.71%) | 16 (4.51%) | |
| Frequent | 14,502 (2.78%) | 6 (1.69%) | |
| Exercise | |||
| No | 263,320 (50.57%) | 193 (54.37%) | 0.358 |
| <150 min/week | 180,540 (34.67%) | 114 (32.11%) | |
| >150 min/week | 76,883 (14.76%) | 48 (13.52%) | |
| Hypertension | |||
| No | 375,652 (72.14%) | 265 (74.65%) | 0.292 |
| Yes | 145,091 (27.86%) | 90 (25.35%) | |
| Diabetes | |||
| No | 461,197 (88.57%) | 317 (89.30%) | 0.665 |
| Yes | 59,546 (11.43%) | 38 (10.70%) | |
| Hyperlipidemia | |||
| No | 489,383 (93.98%) | 337 (94.93%) | 0.451 |
| Yes | 31,360 (6.02%) | 18 (5.07%) |
*P<0.05.