Classical risk factors of cardiovascular disease among Chinese male steel workers: a prospective cohort study for 20 years

Table 3 Two types of classification of adult underweight, overweight and obesity

	BMI (kg/m²)	CVD events	Number	Person years	Incidence (per 1000 person years)	HR	95%CI	Pvalue
The WHO classification †
Underweight	< 18.5	5	99	1999	2.5	0.7	0.29-1.69	0.43
Normal range	18.5-24.9	254	3151	64748	3.92	1	-
Overweight	≥ 25.0	132	988	19541	6.76	1.25	1.00-1.55	< 0.05
Pre-obesity	25.0-29.9	120	929	18450	6.5	1.22	0.97-1.52	0.09
Obesity	≥ 30.0	12	59	1091	11	1.72	0.96-3.08	0.07
The Chinese Classification ‡
Underweight	< 18.5	5	99	1999	2.5	0.72	0.29-1.74	0.46
Normal range	18.5-23.9	204	2655	54726	3.73	1	-
Overweight	≥ 24.0	182	1484	56725	3.21	1.24	1.01-1.52	< 0.05
Pre-obesity	24.0-27.9	145	1265	25398	5.71	1.21	0.97-1.50	0.09
Obesity	≥ 28.0	37	219	4165	8.88	1.37	0.96-1.97	0.09

Adjusted for age, TC, BMI, SBP, and daily cigarette dosage.
† According to World Health Organization' web http://apps.who.int/bmi/index.jsp?introPage=intro_3.html
‡ According to Chinese overweight and obesity prevention guideline

ISSN: 1471-2458