Table 3

Descriptive data of the participants

VariablesNon-nasopharyngeal carcinoma cases (n=520,743)Nasopharyngeal carcinoma cases (n=355)P value
PM2.5 (μg/m3)
 PM2.5<30.42165,634 (31.81%)110 (30.99%)0.260
 30.42≤PM2.5<32.7187,233 (16.75%)47 (13.24%)
 32.71≤PM2.5<40.35142,273 (27.32%)104 (29.3%)
 PM2.5≥40.35125,603 (24.12%)94 (26.48%)
PM10 (μg/m3)
 PM10<50.66130,770 (25.11%)64 (18.03%)0.019*
 50.66≤PM10<58.89118,457 (22.75%)84 (23.66%)
 58.89≤PM10<70.23146,439 (28.12%)113 (31.83%)
 PM10≥70.23125,077 (24.02%)94 (26.48%)
PM10-2.5 (μg/m3)
 PM10-2.5<20.44122,658 (23.55%)59 (16.62%)0.018*
 20.44≤PM10-2.5<24.08138,620 (26.62%)103 (29.01%)
 24.08≤PM10-2.5<29.27126,679 (24.33%)89 (25.07%)
 PM10-2.5≥29.27132,786 (25.5%)104 (29.3%)
SO2 (ppb)
 SO2<3.65131,457 (25.24%)76 (21.41%)0.151
 3.65≤SO2<4.63124,313 (23.87%)77 (21.69%)
 4.63≤SO2<5.81133,527 (25.64%)102 (28.73%)
 SO2≥5.81131,446 (25.24%)100 (28.17%)
NOx (ppb)
 NOx<20.50127,602 (24.5%)73 (20.56%)0.047*
 20.50≤NOx<27.25130,325 (25.03%)91 (25.63%)
 27.25≤NOx<32.80134,522 (25.83%)83 (23.38%)
 NOx≥32.80128,294 (24.64%)108 (30.42%)
O3 (ppb)
 O3<25.71128,955 (24.76%)93 (26.2%)0.300
 25.71≤O3<27.64124,633 (23.93%)97 (27.32%)
 27.64≤O3<30.19139,920 (26.87%)88 (24.79%)
 O3≥30.19127,235 (24.43%)77 (21.69%)
CO (ppm)
 CO<0.47125,976 (24.19%)77 (21.69%)0.111
 0.47≤CO<0.57125,414 (24.08%)86 (24.23%)
 0.57≤CO<0.71138,495 (26.6%)84 (23.66%)
 CO≥0.71130,858 (25.13%)108 (30.42%)
Age (years)
 30≤Age<40115,635 (22.21%)80 (22.54%)<0.001*
 40≤Age<50139,232 (26.74%)119 (33.52%)
 50≤Age<60121,312 (23.3%)99 (27.89%)
 60≤Age<70144,564 (27.76%)57 (16.06%)
BMI (Kg/m2)
 BMI<18.512,853 (2.47%)12 (3.38%)0.025*
 18.5≤BMI<24193,008 (37.06%)155 (43.66%)
 24≤BMI<27179,161 (34.40%)113 (31.83%)
 BMI≥27135,721 (26.06%)75 (21.13%)
Smoking
 Never395,746 (76.00%)283 (79.72%)0.218
 Occasional24,675 (4.74%)19 (5.35%)
 Average <1 pack/day67,793 (13.02%)35 (9.86%)
 Average >1 pack/day32,529 (6.25%)18 (5.07%)
Drinking
 Never375,072 (72.03%)279 (78.59%)0.022*
 Occasional117,233 (22.51%)62 (17.46%)
 Frequent28,438 (5.46%)14 (3.94%)
Betel chewing
 Never481,688 (92.50%)333 (93.80%)0.444
 Occasional24,553 (4.71%)16 (4.51%)
 Frequent14,502 (2.78%)6 (1.69%)
Exercise
 No263,320 (50.57%)193 (54.37%)0.358
 <150 min/week180,540 (34.67%)114 (32.11%)
 >150 min/week76,883 (14.76%)48 (13.52%)
Hypertension
 No375,652 (72.14%)265 (74.65%)0.292
 Yes145,091 (27.86%)90 (25.35%)
Diabetes
 No461,197 (88.57%)317 (89.30%)0.665
 Yes59,546 (11.43%)38 (10.70%)
Hyperlipidemia
 No489,383 (93.98%)337 (94.93%)0.451
 Yes31,360 (6.02%)18 (5.07%)
  • *P<0.05.