Role of body mass index in colon cancer patients in Taiwan

Table 2 Univariate analysis of survival of colon cancer patients stratified according to body mass index category (Taiwan vs World Health Organization)

	Underweight (n = 164)	Normal weight (n = 1109)	Overweight (n = 550)	Obese (n = 315)
BMI category in Taiwan
Overall survival
5-yr survival rate	60.0	73.6	78.2	75.4
HR (95% CI)	1.67 (1.31-2.13)	Reference	0.83 (0.69-0.99)	0.93 (0.74-1.16)
P value	< 0.001		0.046	0.500
Disease-free survival
5-yr survival rate	57.4	70.8	73.4	71.0
HR (95% CI)	1.60 (1.26-2.04)	Reference	0.86 (0.72-1.04)	0.97 (0.79-1.20)
P value	< 0.001		0.103	0.807
Cancer-specific survival
5-yr survival rate	71.6	78.5	78.9	77.3
HR (95% CI)	1.31 (0.94-1.82)	Reference	0.95 (0.77-1.19)	1.01 (0.78-1.32)
P value	0.107		0.657	0.932
BMI categories of WHO	Underweight (n = 164)	Normal-weight (n = 1331)	Overweight (n = 553)	Obese (n = 90)
Overall survival
5-yr survival rate	60.0	74.0	78.2	75.0
HR (95% CI)	1.70 (1.34-2.15)	Reference	0.85 (0.71-1.02)	0.99 (0.66-1.39)
P value	< 0.001		0.072	0.833
Disease-free survival
5-yr survival rate	57.4	71.0	73.2	70.4
HR ( 95% CI)	1.62 (1.28-2.06)	Reference	0.89 (0.74-1.05)	1.05 (0.73-1.49)
P value	< 0.001		0.169	0.808
Cancer-specific survival
5-yr survival rate	71.6	78.2	79.5	75.0
HR (95% CI)	1.30 (0.94-1.80)	Reference	0.92 (0.74-1.13)	1.10 (0.72-1.70)
P value	0.113		0.418	0.661

Except where stated otherwise, data are the percentage of the particular body mass index (BMI) category population. WHO: World Health Organization; HR: Hazard ratio; CI: Confidence interval.