Table 3.

Association between body mass index categories and all-cause mortality, Thai Cohort Study (2005–2010).

Body mass index categories	Adjusted hazard ratio [95% Confidence Intervals] for all-cause mortality by BMI reference bands for two age groups
	Reference (18.5 to <23)			Reference (18.5 to <20.75)		Reference (20.75 to <23)		Reference (23 to <25)
	<35 years	35–65 years		<35 years	35–65 years	<35 years	35–65 years	<35 years	35–65 years
Underweight (<18.5)	1.16 [0.82–1.65]	1.35 [0.66–2.74]		1.15 [0.79–1.68]	1.82 [0.81–4.08]	1.18 [0.79–1.76]	1.13 [0.54–2.35]	1.06 [0.67–1.70]	2.32 [0.99–5.22]
Lower normal (≥18.5 to <20.75)	Reference			Reference		1.02 [0.73–1.43]	0.62 [0.36–1.08]	0.93 [0.62–1.39]	1.27 [0.66–2.45]
Upper normal (≥20.75 to <23)				0.98 [0.70–1.36]	1.61 [0.93–2.81]	Reference		0.90 [0.60–1.36]	2.05  [1.19–3.53]
Overweight (≥23 to <25)	1.09 [0.75–1.58]		0.57  [0.34–0.96]	1.08 [0.72–1.62]	0.79 [0.41–1.51]	1.11 [0.73–1.67]	0.49  [0.28–0.84]	Reference
Obese I (≥25 to <30.0)	1.12 [0.74–1.69]		0.93 [0.59–1.47]	1.11 [0.71–1.73]	1.28 [0.69–2.35]	1.13 [0.73–1.77]	0.79 [0.49–1.29]	1.02 [0.62–1.68]	1.63 [0.90–2.93]
Obese II (≥30)	0.63 [0.20–1.99]		1.74 [0.79–3.81]	0.63 [0.20–1.20]	2.37  [1.01–5.70]	0.64 [0.20–2.05]	1.47 [0.66–3.28]	0.58 [0.18–1.89]	3.02  [1.26–7.22]

^*Hazard ratios were adjusted for baseline covariates including sex, age in years, personal monthly income, paid work hours, rural-urban residence, self-assessed health at baseline,

smoking status, alcohol drinking status, and physical activity.

^**Bold results were statistically significant at P < 0.05.