Table 1.

Baseline characteristics of the study participants in the SAGE.

Characteristics	Total participants (%)	Person years of follow-up	Depression incidence
			No (%)	Yes (%)
Total	8,481 (100.00)	58,972	8,291 (97.76)	190 (2.24)
Sex
Male	4,126 (48.65)	29,263	4,060 (98.40)	66 (1.60)
Female	4,355 (51.35)	29,709	4,231 (97.15)	124 (2.85)
Age (years)
$<60$	3,957 (46.66)	27,930	3,890 (98.31)	67 (1.69)
$\ge 60$	4,524 (53.34)	31,042	4,401 (97.28)	123 (2.72)
Marital status
Married	7,336 (86.50)	51,007	7,190 (98.01)	146 (1.99)
Unmarried	1,145 (13.50)	7,965	1,101 (96.16)	44 (3.84)
Urbanicity
Rural	4,834 (57.00)	34,034	4,730 (97.85)	104 (2.15)
Urban	3,647 (43.00)	24,938	3,561 (97.64)	86 (2.36)
Education
Low	3,587 (42.29)	24,896	3,481 (97.04)	106 (2.96)
Moderate and high	4,894 (57.71)	34,076	4,810 (98.28)	84 (1.72)
Annual family income (Yuan)
Low ($\le \mathrm{18,000}$)	4,363 (51.44)	32,127	4,244 (97.27)	119 (2.73)
High ($>\mathrm{18,000}$)	4,118 (48.56)	26,845	4,047 (98.28)	71 (1.72)
Region
Southern China	5,291 (62.39)	36,916	5,190 (98.09)	101 (1.91)
Northern China	3,190 (37.61)	22,056	3,101 (97.21)	89 (2.79)
Smoking status
Nonsmoker	5,615 (66.21)	38,210	5,474 (97.49)	141 (2.51)
Smoker	2,866 (33.79)	20,762	2,817 (98.29)	49 (1.71)
Drinking status
Nondrinker	5,722 (67.47)	38,687	5,587 (97.64)	135 (2.36)
Drinker	2,759 (32.53)	20,285	2,704 (98.01)	55 (1.99)
Household cooking fuel
Clean fuel	4,694 (55.35)	30,610	4,600 (98.00)	94 (2.00)
Unclean fuel	3,787 (44.65)	28,362	3,691 (97.47)	96 (2.53)
Vegetable intake
Sufficient intake	5,828 (70.75)	43,103	5,697 (97.75)	131 (2.25)
Insufficient intake	2,410 (29.25)	14,308	2,354 (97.68)	56 (2.32)
Missing	243	1,561	240 (98.77)	3 (1.23)
Fruit intake
Sufficient intake	1,252 (15.75)	9,341	1,232 (98.40)	20 (1.60)
Insufficient intake	6,695 (84.25)	46,072	6,536 (97.63)	159 (2.37)
Missing	534	3,559	523 (97.94)	11 (2.06)

Note: SAGE, Study on Global Ageing and Adult Health.