Table 4 Crude and adjusted rate ratios for total cost of admission for readmission within seven and 28 days of discharge from multiday elective surgery between non-smokers and ex- or current smokers

Ex-smoker

1.42 (1.16, 1.74)

0.001

1.17 (0.97, 1.41)

0.107

1.27 (1.10, 1.46)

0.001

1.12 (0.97, 1.30)

0.127

Current smoker

1.71 (1.25, 2.34)

0.001

1.51 (1.15, 1.98)

0.003

1.49 (1.25, 1.78)

<0.001

1.38 (1.16, 1.64)

<0.001

Age group (ref <30)

 30-39

0.70 (0.45, 1.11)

0.130

0.98 (0.69, 1.39)

0.919

 40-49

1.11 (0.69, 1.77)

0.674

1.35 (0.95, 1.90)

0.091

 50-59

0.97 (0.62, 1.52)

0.909

1.18 (0.87, 1.61)

0.278

 60-69

1.23 (0.78, 1.93)

0.375

1.34 (0.99, 1.82)

0.062

 70-79

1.35 (0.84, 2.18)

0.213

1.64 (1.20, 2.24)

0.002

 >80

1.31 (0.84, 2.04)

0.231

1.25 (0.92, 1.70)

0.160

Female

0.94 (0.77, 1.14)

0.503

0.89 (0.79, 1.02)

0.092

Indigenous

1.17 (0.72, 1.89)

0.528

1.18 (0.88, 1.57)

0.266

Admission > 3 days (ref ≤ 3 days)

1.46 (1.21, 1.77)

<0.001

1.37 (1.20, 1.57)

<0.001