Table 1.

Odds-ratios of frequency of physical exercise (exposure reference category: Almost every day) associated with BMI category (outcome reference category: normal weight) among Norwegian university students in 2010, 2014 and 2018. ORs adjusted for age and gender

Exercise frequency	Normal weight (reference)		Overweight (BMI 25.0–29.9)				Obesity (BMI ≥ 30)
	%	(n)	%	(n)	OR	95% CI	%	(n)	OR	95% CI
2018
Never	3.8%	(1191)	3.9%	(442)	1.12	0.99–1.26	7.0%	(299)	3.29***	2.82–3.84
< 1 x/wk	11.0%	(3419)	12.7%	(1440)	1.28***	1.18–1.38	18.8%	(805)	3.00***	2.68–3.36
1 x/wk	15.1%	(4684)	16.3%	(1850)	1.22***	1.14–1.31	19.0%	(814)	2.22***	1.98–2.48
2–3 x/wk	44.4%	(13797)	44.3%	(5044)	1.14**	1.08–1.21	40.9%	(1749)	1.63***	1.48–1.79
Almost every day (ref)	25.7%	(7990)	22.8%	(2599)	1.00	–	14.2%	(606)	1.00	–
2014
Never	11.4%	(1011)	12.9%	(323)	1.13	0.92–1.40	20.2%	(136)	2.79***	1.83–4.23
< 1 x/wk	15.8%	(1395)	17.9%	(447)	1.18	0.96–1.44	22.8%	(154)	2.32***	1.54–3.51
1 x/wk	42.1%	(3726)	39.0%	(975)	0.99	0.82–1.18	39.0%	(263)	1.52*	1.02–2.26
2–3 x/wk	23.6%	(2090)	23.0%	(576)	1.02	0.84–1.23	13.8%	(93)	0.98	0.63–1.50
Almost every day (ref)	7.1%	(631)	7.2%	(180)	1.00	–	4.2%	(28)	1.00	–
2010
Never	14.0%	(593)	16.8%	(184)	1.98***	1.33–2.94	25.8%	(60)	3.94***	1.60–9.71
< 1 x/wk	20.9%	(887)	23.1%	(253)	1.86***	1.27–2.74	29.2%	(68)	3.03***	1.23–7.42
1 x/wk	42.1%	(1785)	41.6%	(456)	1.65**	1.14–2.40	34.8%	(81)	1.81	0.74–4.40
2–3 x/wk	17.9%	(757)	15.2%	(166)	1.34	0.90–1.99	8.2%	(19)	1.00	0.38–2.65
Almost every day (ref)	5.0%	(213)	3.3%	(36)	1.00	–	2.1%	(5)	1.00	–

*** p < .001; ** p < .01; * p < .05;