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Table 3 Relative risk (RR) and 95% confidence interval (CI) of NPC for males and females by age-period-cohort analysis in Sihui County, Guangdong Province, South China

From: Incidence trend of nasopharyngeal carcinoma from 1987 to 2011 in Sihui County, Guangdong Province, South China: an age-period-cohort analysis

Parameter Category Males Females
RR 95% CI RR 95% CI
Age (years) 30-34 1.00 (Ref)   1.00 (Ref)  
35-39 1.64 1.24–2.20 2.25 1.59–3.23
40-44 2.73 2.05–3.68 3.08 2.07–4.71
45-49 3.21 2.36–4.45 3.08 1.93–5.23
50-54 3.60 2.53–5.28 5.00 2.93–9.48
55-59 4.15 2.75–6.51 6.82 3.65–14.77
60-64 3.52 2.16–6.04 5.74 2.68–14.57
65-69 2.89 1.60–5.49 5.62 2.31–16.65
70-74 2.90 1.41–6.26 5.31 2.55–15.00
Period 1987-1991 1.00 (Ref)   1.00 (Ref)  
1992-1996 1.01 0.80–1.28 0.92 0.68–1.26
1997-2001 0.93 0.70–1.23 0.77 0.51–1.14
2002-2006 0.89 0.63–1.25 0.56 0.33–0.92
2007-2011 1.01 0.68–1.45 0.59 0.31–1.01
Cohort 1920-1924 0.58 0.26–1.24 0.62 0.25–1.45
1925-1929 1.05 0.62–1.77 0.53 0.26–1.06
1930-1934 0.97 0.64–1.47 0.59 0.34–1.00
1935-1939 1.12 0.82–1.55 0.56 0.36–0.87
1940-1944 1.00 (Ref)   1.00 (Ref)  
1945-1949 1.18 0.91–1.54 1.10 0.77–1.58
1950-1954 1.36 1.03–1.79 1.54 1.06–2.30
1955-1959 1.38 1.02–1.91 1.53 0.97–2.56
1960-1964 1.27 0.88–1.89 1.39 0.79–2.69
1965-1969 1.18 0.75–1.89 1.75 0.90–3.89
1970-1974 1.23 0.73–2.17 2.40 1.11–6.14