Table 5: Anomalous cell frequency observed in 1000 cells depending on HNC risk factors.

Anomalous cell (mean ± SD)
MNBN
ControlsCases Controls Cases

Tobacco smoking
 No
 Yes ** **
valueNSNS0.0460.045
Alcohol drinking
 No ** **
 Yes
-valueNSNS
Tobacco chewing
 No ** **
 Yes ** **
-valueNS0.030NSNS
Occupational exposure
 No ** **
 Yes ** **
-valueNS0.014NSNS
Amalgam fillings
 No ** **
 Yes * *
-valueNSNSNSNS

Significantly different compared with the control group, .
*Significantly different compared with the control group, .
NS: nonsignificant.