Table 1. General characteristics of the participants in two Surveys from 2001 and 2010.

Characteristics	2001 (n = 2,277)	2010 (n = 2,102)	P
Age, mean (SD)	67.9 (5.8)	71.2 (6.6)	<0.001
	% (95% CI)	% (95% CI)
60-	63.8 (61.8–65.7)	39.1 (37.0–41.2)	<0.001
70-	31.8 (29.9–33.8)	51.7 (49.6–53.9)
80-	4.4 (3.6–5.2)	9.2 (8.0–10.5)
Sex
Male	41.4 (39.4–43.4)	40.3 (38.2–42.4)	0.471
Female	58.6 (56.6–60.6)	59.7 (57.6–61.8)
Marital status			0.759
Married	84.1 (82.6–85.6)	84.4 (82.8–86.0)
Single or divorced or widowed	15.9 (14.4–17.5)	15.6 (14.1–17.2)
Occupation			<0.001
White collar	48.8 (46.7–50.9)	33.7 (31.7–35.8)
Light physical labor	44.7 (42.7–46.8)	36.2 (34.2–38.3)
Hard physical labor	6.5 (5.5–7.5)	30.1 (28.1–32.0)
Education level (years)			<0.001
0–6	42.3 (40.3–44.3)	27.6 (25.9–29.5)
7–12	34.8 (32.9–36.8)	40.4 (38.3–42.5)
13∼	22.9 (21.2–24.6)	32.0 (30.0–34.0)

P is for 2001 vs. 2010;

Data are mean (SD) for continuous values or n (%) for category values.