. 2018 Mar 12;10:29. doi: 10.1186/s13195-018-0355-1

Table 3.

Levels of cognitive performance and pulse pressure in elderly Chinese participants at each time point

Variable	2011			2013			2015
Variable	No. of participants	Mean ± SD	P value^a	No. of participants	Mean ± SD	P value^a	No. of participants	Mean ± SD	P value^a
Cognitive score		F = 127.77, P < 0.001^b
Total	9384	10.17 ± 4.34		9132	10.31 ± 4.36		9048	9.80 ± 4.46
Age, years
45–59	5071	10.99 ± 4.08	<0.001	5015	11.20 ± 4.07	<0.001	5068	10.73 ± 4.15	<0.001
60–64	1731	10.26 ± 4.21		1711	10.29 ± 4.15		1704	9.77 ± 4.34
65–79	2351	8.76 ± 4.39		2248	8.67 ± 4.49		2138	7.93 ± 4.49
80+	231	5.95 ± 3.98		158	5.82 ± 4.30		138	4.96 ± 4.04
Sex
Male	4349	11.19 ± 3.93	<0.001	4253	11.34 ± 3.92	<0.001	4204	10.77 ± 4.05	<0.001
Female	5030	9.29 ± 4.53	<0.001	4873	9.42 ± 4.53		4839	8.97 ± 4.62
Pulse pressure	F = 11.09, P < 0.001^b
Total	8853	54.98 ± 15.06		7668	55.47 ± 14.87		8171	54.51 ± 14.59
Age years
45–59	4563	50.38 ± 11.87	<0.001	4112	50.90 ± 11.96	<0.001	4492	50.06 ± 11.78	<0.001
60–64	1590	55.87 ± 14.42		1482	56.78 ± 14.30		1528	56.35 ± 13.92
65–79	2185	62.29 ± 16.82		1957	62.86 ± 16.48		1992	61.88 ± 16.06
80+	215	71.71 ± 18.38		171	69.64 ± 17.82		159	70.44 ± 20.12
Sex
Male	3972	54.31 ± 13.71	<0.001	3577	55.11 ± 13.92	0.045	3768	54.12 ± 14.00	0.026
Female	4577	55.56 ± 16.11	<0.001	4086	55.78 ± 15.63	0.045	4397	54.84 ± 15.07	0.026

^aP value was calculated by one-way analysis of variance (ANOVA)

^bP value was calculated by one-way repeated measures ANOVA

Owing to missing data for some variables, the number of cases does not always sum to 9750