Table 3 Relative risk (RR) and 95 % confidence interval (CI) of PLC incidence for both sexes by age-period-cohort model in Sihui, China

Age (years)

30–34

0.04

0.03–0.07

0.12

0.05–0.28

35–39

0.09

0.07–0.13

0.22

0.11–0.44

40–44

0.23

0.18–0.30

0.42

0.24–0.72

45–49

0.39

0.31–0.48

0.45

0.28–0.73

50–54

0.63

0.53–0.75

0.87

0.59–1.28

55–59

60–64

1.24

1.03–1.49

1.54

1.06–2.21

65–69

1.96

1.57–2.45

2.27

1.48–3.49

70–74

2.36

1.78–3.12

2.49

1.48–4.18

75–79

3.23

2.26–4.61

2.80

1.49–5.26

80–84

3.61

2.20–5.96

3.86

1.78–8.36

Period

1987–1991

1.70

1.33–2.18

1.05

0.66–1.67

1992–1996

1.50

1.25–1.80

1.35

0.97–1.89

1997–2001

2002–2006

0.96

0.86–1.07

0.70

0.55–0.88

2007–2011

1.00

0.91–1.25

1.00

0.61–1.52

Cohort

1910–1914

0.11

0.04–0.29

0.17

0.04–0.68

1915–1919

0.15

0.08–0.34

0.08

0.02–0.34

1920–1924

0.20

0.12–0.32

0.44

0.20–0.96

1925–1929

0.46

0.32–0.65

0.49

0.26–0.93

1930–1934

0.52

0.39–0.69

1.02

0.62–1.67

1935–1939

0.80

0.64–1.00

1.00

0.65–1.52

1940–1944

0.88

0.73–1.06

1.09

0.75–1.58

1945–1949

1950–1954

1.51

1.24–1.82

1.67

1.12–2.50

1955–1959

2.03

1.63–2.54

1.68

1.04–2.70

1960–1964

2.22

1.70–2.90

1.24

0.69–2.23

1965–1969

2.60

1.88–3.61

1.59

0.78–3.21

1970–1974

4.18

2.84–6.15

1.13

0.47–2.71