Table 2 Relation of baseline risk factors to baseline CRP, peak post-operative CRP and absolute change in CRP following surgery

Baseline CRP (per 10 fold increase)

2.44 (1.76-3.38) p < 0.0001

1.23 (0.86-1.76) ns

Waist:hip ratio (per 10% increase)

1.70 (1.22-2.37) p = 0.0022

1.86 (1.44-2.40) p < 0.0001

1.52 (1.17-1.98) p = 0.0019

BMI(per unit change)

1.06 (0.97-1.16) p = 0.16

1.05 (0.97-1.12) p = 0.24

1.06 (0.99-1.14) p = 0.1

Waist circumference (per 10 cm increase)

1.68 (1.28- 2.20) p = 0.0002

1.60 (1.29- 1.98)

1.43 (1.15- 1.77) p = 0.0015

P < 0.0001

Weight (per 10 kg increase)

1.21 (0.95-1.52)

1.14 (0.95-1.39)

1.16 (0.97-1.39) p = 0.09

Age (per decade)

1.38 (1.15-1.66) p = 0.0006

1.32 (1.14-1.52) p = 0.0003

1.18 (1.02-1.37) p = 0.02

Duration of surgery (per minute)

1.05 (1.01-1.11) p = 0.04

1.06 (1.02-1.10) p = 0.003

1.05 (1.02-1.09) p = 0.007

Wound length (per cm)

1.46 (1.06-2.00) p = 0.02

1.33 (1.03-1.73) p = 0.03

1.28 (0.99-1.65) p = 0.06

*Ethnic Group: n, %

White Caucasian

1.46 (1.00-2.63)

1.38 (0.91- 1.51)

1.17 (0.78- 1.74)

Afro Carib

1.27 (0.66- 2.43)

0.83 (0.55- 1.50)

0.87 (0.50- 1.73)

Asian

1.67 (0.73- 3.84)

1.15 (0.55- 2.40)

1.12 (0.54- 2.30)

Other (ref)

0.29 P = 0.06

0.75

0.88

*Smoking status (%)

Current (reference)

0.80

0.87

0.93 (0.70-1.24)

Ex

1.66 (1,12- 2.45)

1.30 (0.95- 1,78)

1.13 (0.82- 1.56)

Never

0.76 (0.53- 1.08) P = 0.04

0.88 (0.66- 1.17)

0.95

Exercise

<2 × /week (reference)

2 + ×/week

0.64 (0.36-1.13) p = 0.12

0.95 (0.59-1.52)

1.14 (0.72-1.79)

*Occupation

Manual (reference)

0.73 (0.47- 1.14)

0.68 (0.48- 0.96)

0.69 (0.48- 0.99)

Non-manual

0.80 (0.54- 1.17)

1.06 (0.78- 1.43)

1.18 (0.87- 1.60)

retired

1.73 p = 0.007

1.39 P = 0.1

1.23 P = 0.002

Anti-hypertensive medication

1.63 (0.86-3.10)

1.91 (1.13-2.61) p = 0.02

1.82 (1,10-2.61) P = 0.02