Secular trends: a ten-year comparison of the amount and type of physical activity and inactivity of random samples of adolescents in the Czech Republic

Table 1 Sample characteristics: adolescents eligible for analysis by BMI and by meeting health recommendations^†

	Older Cohort (1998-2000)		Younger Cohort (2008-2010)
	n	%	n	%	P value
Whole sample
Boys	201	52.6	209	40.2	<0.01
Girls	181	47.4	311	59.8	<0.01
Younger adolescents (14 to < 16 years)
Boys	65	44.5	86	53.1	0.13
Girls	81	55.5	76	46.9	0.13
Older adolescents (16 to 18 years)
Boys	136	57.6	123	34.4	<0.01
Girls	100	42.4	235	65.6	<0.01
BMI according to cut-off points*
Normal weight	361	94.5	466	89.6	<0.01
Overweight	20	5.2	44	8.5	0.06
Obese	1	0.3	10	1.9	0.02
Meet health recommendations for achieved daily step counts ^†
Boys	136	67.7	114	54.5	<0.01
Girls	136	75.1	230	74.0	0.73

n: sample size; statistical significance based on test for difference between proportions; * in accordance with international recommended cut off points [27–29]; ^†Czech recommendations for health-enhancing daily number of steps achieved (9,000 or 11,000 for girls and boys respectively) [8]

ISSN: 1471-2458