Table 2. Proportions of BMI and waist circumference categories at baseline and 3-year follow-up, cross-sectional analysis.

	Baseline		3-year follow-up		P values
	n	% a	n	% a
BMI
Mean BMI	2941	22.8	2941	23.1	<0.001 b
Underweight	295	10.0	239	8.1	<0.001 c
Normal	1348	45.8	1367	46.5
Overweight	589	20.0	555	18.9
Obese	709	24.1	780	26.5
Waist circumference
All (mean, cm)	2956	79.1	2956	80.6	<0.001 b
Male (mean, cm)	1398	82.6	1398	83.8	<0.001 b
<70	119	8.5	75	5.2	<0.001 c
70-<80	408	29.3	424	29.6
80-<90	549	39.3	565	39.5
≥90	322	23.0	368	25.7
Female (mean, cm)	1558	76.0	1558	77.7	<0.001 b
<70	455	29.2	350	21.9	<0.001 c
70-<80	589	37.8	641	40.0
80-<90	367	23.6	416	26.0
≥90	147	9.4	194	12.1
Central obesity
All	836	28.3	958	32.4	<0.001 b
Male	322	23.0	365	26.1	<0.01 b
Female	514	33.0	593	38.1	<0.001 b

^a Column percentage unless otherwise stated.

^b P value from paired t-test between baseline and 3-year follow-up.

^c P value from signed-rank test between baseline and 3-year follow-up.