Table 1.

The basic distribution of different categories of Tibetan university students in high-altitude areas (%).

Classification	Boys	Girls	Total
N	2,745	3,514	6,259
Age
19 yrs	785 (28.6)	1,210 (34.4)	1,995 (31.9)
20 yrs	836 (30.5)	1,182 (33.6)	2018 (32.2)
21 yrs	635 (23.1)	758 (21.6)	1,393 (22.3)
22 yrs	489 (17.8)	364 (10.4)	853 (13.6)
An only child
Yes	900 (32.8)	698 (19.9)	1,598 (25.5)
No	1,845 (67.2)	2,816 (80.1)	4,661 (74.5)
SES
Lower	475 (17.3)	493 (14.0)	968 (15.5)
Middle	1,898 (69.1)	2,534 (72.1)	4,432 (70.8)
High	372 (13.6)	487 (13.9)	859 (13.7)
Sleep quality
Good (≤5 points)	834 (30.4)	880 (25.0)	1714 (27.4)
Poor (>5 points)	1911 (69.6)	2,634 (75.0)	4,545 (72.6)
Screen time
≤2 h/d	777 (28.3)	844 (24.0)	1,621 (25.9)
>2 h/d	1,968 (71.7)	2,670 (76.0)	4,638 (74.1)
BMI
Slimmer	294 (10.7)	738 (21.0)	1,032 (16.5)
Normal	1,416 (51.6)	1,884 (53.6)	3,300 (52.7)
Overweight	525 (19.1)	281 (8.0)	806 (12.9)
Obese	510 (18.6)	611 (17.4)	1,121 (17.9)
SSBs consumption
≤1 times/week	1,541 (56.1)	2,017 (57.4)	3,558 (56.8)
2–4 times/week	562 (20.5)	912 (26.0)	1,474 (23.6)
≥5 times/week	642 (23.4)	585 (16.6)	1,227 (19.6)
Duration of physical exercise
<30 min/d	1,820 (66.3)	2,833 (80.6)	4,653 (74.3)
30–60 min/d	671 (24.4)	489 (13.9)	1,160 (18.5)
>60 min/d	254 (9.3)	192 (5.5)	446 (7.1)
Depressive symptoms
No depressive symptoms	1,581 (57.6)	1,955 (55.6)	3,536 (56.5)
Mild depression symptoms	495 (18.0)	766 (21.8)	1,261 (20.1)
Moderate depression symptoms	629 (22.9)	741 (21.1)	1,370 (21.9)
Major depressive symptoms	40 (1.5)	52 (1.5)	92 (1.5)

N, Numbers; yrs, years; SES, Socioeconomic Status; BMI, Body Mass Index; SSBs, Sugar-sweetened beverages; h/d, Hours/day; min/d, Minutes/day.