Table 2 Characteristics of participants according to different combinations of body mass index and leisure-time physical activity levels in the HUNT4 oral health study (n = 4752).

	Normal weight & active	Combination of BMI and leisure-time PA^a
	Normal weight & active	Normal weight & inactive	Overweight/obese& active	Overweight/obese & inactive
N	1084	612	1613	1443
D₃MFT	13.2 ± 7.1	13.3 ± 7.3	15.7 ± 6.4	15.9 ± 6.7
D₃T	1.1 ± 1.6	1.4 ± 1.9	1.4 ± 1.8	1.5 ± 2.0
Age (Mean ± SD)	48.1 ± 17.5	47.2 ± 17.9	53.3 ± 14.7	53.8 ± 15.9
Age (years), %
< 65	80.4	79.7	76.8	72.3
≥ 65	19.6	20.3	23.2	27.7
Female, %	65.3	62.6	51.5	49.8
Smoking status, %
Never	54.7	48.5	45.9	37.6
Former	39.5	38.7	49.2	50.5
Current	5.4	12.7	4.8	11.5
Unknown	0.5	0.0	0.1	0.4
Sugary drink intake (glass), %
Almost not	61.6	46.4	61.6	51.2
1–6 per week	34.9	44.8	33.6	41.9
≥ 2 per day	1.8	8.0	2.4	4.9
Unknown	1.7	1.0	1.4	2.0
Education (years), %
≤ 10	4.3	7.5	5.4	9.9
11─14	39.3	48.7	48.2	51.4
> 14	56.3	43.5	46.1	38.3
Unknown	0.1	0.3	0.2	0.3
Household income (NOK) ^b, %
Low	22.6	31.5	20.6	28.8
Middle	48.8	45.6	55.2	52.9
High	26.6	19.9	22.7	16.6
Unknown	2.0	2.9	1.5	1.7

BMI, Body mass index; D₃MFT, The Decayed, Missing and Filled Teeth index; D₃T, Decayed dentine teeth; HUNT, The Trøndelag Health Study; MT, Missing teeth regardless of the reason; PA, physical activity; ST, Teeth without initial or dentine caries, filling and/or other restorations and without bridge abutment.^aParticipants were categorized into four groups according to different combinations of BMI and leisure-time PA: 1) normal weight & active; 2 )normal weight & inactive; 3)overweight/obese & active;4) overweight/obese & inactive. Due to limited cases in underweight group (36 cases), underweight and normal weight were collapsed into one group as normal weight. Participants who were inactive were those with no or low PA. Active participants were those with moderate or high PA. ^b NOK: Norwegian Kroner. Income (low:<450,000 kr, middle: 451,000-1000,000 kr, high: >1000,000 kr, unknown).

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