Associations of sedentary behavior and physical activity with physical measurements and dyslipidemia in school-age children: a cross-sectional study

Table 1 Basic characteristics of participants by gender

	Boys	Girls
Number of participants, n	398	372
Average age, year (mean ± SD)	9.3 ± 1.8	9.4 ± 1.7
Living areas, n
Urban	311	272
Rural	87	100
Anthropometric measurements (mean ± SD)
Height, cm	136.1 ± 11.2	136.5 ± 11.4
Weight, kg	33.1 ± 11.2	32.1 ± 10.0
BMI z-score	0.24 ± 1.53	−0.05 ± 1.33
WHR	0.84 ± 0.06	0.821 ± 0.06
WHtR	0.45 ± 0.05	0.44 ± 0.04
SB, n
Screen time^a
Any item ≥1.0 h/day	172	139
All items <1.0 h/day	226	233
Other leisure-time SB^b
Either item ≥1.0 h/day	121	121
both items <1.0 h/day	277	251
PA, n
Leisure-time PA^c
< 60 mins/week (lowest 25%)	86	59
≥ 60 mins/week (highest 75%)	254	266
School-time PA^d
< 100 mins/week (lowest 25%)	51	71
≥ 100 mins/week (highest 75%)	276	235
Blood lipid profiles, mmol/L (mean ± SD)
TC	3.84 ± 0.64	3.86 ± 0.67
TG	0.97 ± 0.55	1.02 ± 0.57
HDL-C	1.47 ± 0.34	1.44 ± 0.31
LDL-C	1.87 ± 0.51	1.89 ± 0.55
Prevalence of dyslipidemia, n	47	37

Significant difference between groups were marked in bold. Differences between genders were calculated by t-tests for continuous variables and Rao-Scott χ ² test for categorical variables (clustering in class level and strata in grade level and investigation area level were considered)
SB sedentary behavior, PA physical activity
^ascreen time includes ① Watching TV; ② Watching video, VCD, or DVD; ③ Using a computer; ④ Using a cell phone
^bOther leisure time SB includes ① Reading, writing, drawing; ② Playing chess, playing with toys or dolls while sitting; and other sedentary behaviors
^cLeisure-time PA includes running, swimming, riding bicycles, playing football, basketball, table tennis, badminton, dancing, climbing mountains, skating, rope skipping, playing hopscotch, rubber band skipping, beanbag games, other group games (chasing or romping), and other physical activities
^dSchool-time PA includes physical education classes and calisthenics during the break

ISSN: 1471-2458