Table 1.

Incidence and hazard ratio (95% CI) of developing nasopharyngeal carcinoma by sociodemographic characteristics at study entry

VariableParticipant number (%)Person-yearsNasopharyngeal carcinoma
Case no.Incidence rate*Hazard ratio (95% CI)
Age (y)
    <401,871 (19.5)39,014.4820.51.0 (reference)
    40-492,344 (24.4)47,090.3817.00.8 (0.3-2.2)
    50-592,700 (28.0)50,048.3816.00.8 (0.3-2.1)
    ≥602,707 (28.1)37,552.7821.31.1 (0.4-3.1)
Ethnicity
    Fukkienese3,226 (33.5)55,368.8712.61.0 (reference)
    Hakka6,395 (66.5)118,315.62521.11.7 (0.7-3.9)
    Missing121.300
Years of schooling
    <11,047 (11.1)14,905.0213.41.0 (reference)
    1-65,336 (56.7)95,176.61717.91.3 (0.3-5.4)
    ≥73,036 (32.2)60,046.81118.31.3 (0.3-5.7)
    Missing2033,577.3255.9
  • * Per 100,000 person-years.