Table 1.

Characteristics of the study population (n = 1580).

Variables	HPA		Total (n)	Yes (%)	χ2	p
	Yes (n)	No (n)
Gender					1.330	0.249
Male	342	238	580	59.0
Female	619	381	1000	61.9
Age (year)					25.210	0.000
60–65	379	259	638	59.4
66–70	299	159	458	65.3
71–75	236	135	371	63.6
>75	47	66	113	41.6
Education					2.212	0.832
Illiterate	125	90	215	58.1
Elementary school	179	108	287	62.4
Middle school	251	169	420	59.8
High school	315	188	503	62.6
College	61	43	104	58.7
University	30	21	51	58.8
Income (RMB)					14.890	0.005
<1000	144	132	276	52.2
1000–2000	524	288	812	64.5
2001–3000	143	85	228	62.7
3001–4000	118	94	212	55.7
>4000	32	20	52	61.5

Abbreviation: HPA = habitual physical activity.