Table 1.

Age-period-cohort (APC) model analysis of stroke mortality in urban and rural China showing the results of APC analysis using the intrinsic estimator approach.¹⁵

	Urban				Rural
	APC	SE	95% CI	Rate ratio*	APC	SE	95% CI	Rate ratio*
Intercept	−7.37	0.03	−7.44, −7.31	0.00	−7.28	0.05	−7.38, −7.19	0.00
Age (year)
20–24	−3.49	0.23	−3.94, −3.03	0.03	−3.16	0.29	−3.73, −2.59	0.04
25–29	−2.96	0.17	−3.29, −2.63	0.05	−2.80	0.23	−3.25, −2.35	0.06
30–34	−2.07	0.12	−2.32, −1.83	0.13	−2.09	0.17	−2.43, −1.75	0.12
35–39	−1.34	0.09	−1.53, −1.16	0.26	−1.38	0.13	−1.63, −1.13	0.25
40–44	−0.58	0.08	−0.72, −0.43	0.56	−0.62	0.10	−0.82, −0.43	0.54
45–49	−0.03	0.06	−0.15, 0.09	0.97	−0.21	0.08	−0.37, −0.05	0.81
50–54	0.43	0.05	0.33, 0.53	1.54	0.41	0.07	0.28, 0.54	1.51
55–59	0.74	0.04	0.66, 0.83	2.10	0.69	0.06	0.58, 0.80	1.99
60–64	1.18	0.03	1.11, 1.25	3.25	1.11	0.04	1.02, 1.20	3.03
65–69	1.55	0.03	1.49, 1.60	4.69	1.46	0.04	1.39, 1.54	4.32
70–74	1.93	0.03	1.88, 1.98	6.90	1.91	0.04	1.84, 1.99	6.77
75–79	2.20	0.03	2.14, 2.26	9.01	2.17	0.04	2.09, 2.25	8.75
80–84	2.44	0.04	2.37, 2.52	11.49	2.51	0.05	2.41, 2.61	12.31
Period (year)
1988	−0.31	0.03	−0.37, −0.25	0.73	−0.42	0.05	−0.51, −0.33	0.66
1993	−0.12	0.02	−0.17, −0.08	0.89	−0.29	0.03	−0.35, −0.22	0.75
1998	0.10	0.02	0.07, 0.14	1.11	0.02	0.02	−0.02, 0.07	1.02
2003	0.09	0.02	0.06, 0.13	1.10	−0.02	0.02	−0.07, 0.02	0.98
2008	−0.07	0.02	−0.11, −0.02	0.94	0.23	0.03	0.17, 0.29	1.26
2013	0.30	0.03	0.24, 0.36	1.35	0.47	0.04	0.40, 0.55	1.61
Cohort (years)
1904–1908	1.79	0.07	1.65, 1.92	5.97	1.64	0.10	1.45, 1.83	5.15
1909–1913	1.54	0.05	1.44, 1.65	4.68	1.39	0.07	1.25, 1.54	4.02
1914–1918	1.32	0.04	1.24, 1.41	3.76	1.19	0.06	1.07, 1.30	3.27
1919–1923	1.09	0.04	1.03, 1.16	2.99	1.00	0.05	0.90, 1.09	2.71
1924–1928	0.90	0.03	0.84, 0.96	2.46	0.90	0.04	0.82, 0.98	2.46
1929–1933	0.63	0.03	0.57, 0.69	1.87	0.61	0.04	0.53, 0.70	1.85
1934–1938	0.29	0.04	0.22, 0.36	1.34	0.34	0.05	0.24, 0.43	1.40
1939–1943	−0.06	0.05	−0.15, 0.03	0.94	0.04	0.06	−0.08, 0.16	1.04
1944–1948	−0.28	0.05	−0.39, −0.18	0.76	−0.13	0.07	−0.28, 0.01	0.87
1949–1953	−0.45	0.06	−0.58, −0.33	0.64	−0.32	0.09	−0.49, −0.16	0.72
1954–1958	−0.61	0.07	−0.75, −0.47	0.55	−0.56	0.10	−0.76, −0.37	0.57
1959–1963	−0.75	0.08	−0.91, −0.58	0.48	−0.77	0.12	−1.01, −0.54	0.46
1964–1968	−0.95	0.10	−1.14, −0.76	0.39	−0.71	0.13	−0.97, −0.46	0.49
1969–1973	−0.89	0.11	−1.11, −0.67	0.41	−0.93	0.15	−1.23, −0.63	0.40
1974–1978	−1.04	0.15	−1.33, −0.75	0.35	−1.04	0.21	−1.45, −0.63	0.35
1979–1983	−0.92	0.19	−1.30, −0.54	0.40	−0.87	0.28	−1.42, −0.32	0.42
1984–1988	−0.63	0.25	−1.12, −0.14	0.54	−0.71	0.35	−1.40, −0.01	0.49
1989–1993	−0.99	0.46	−1.89, −0.10	0.37	−1.05	0.62	−2.26, 0.16	0.35

^*Rate ratios were calculated from estimated model parameters that represented the mortality level. Mortality change was expressed by the difference in rate ratio before and after the birth cohort.

Emboldened values are statistically significant at P < 0.05.

SE, standard error; CI, confidence interval.