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Table 4 Subgroup analysis of outcomes based on the smoking exposure duration

From: Smoking is a significant contributor to intraoperative blood loss in metastatic spinal tumor surgery: a propensity score analysis

Characteristics

Overall

Smoking exposure duration

P

None

Short term

Long term

Before propensity score analysis

     

n

252

164

52

36

 

Blood loss (mL, median [IQR])

1820.44 [1284.71, 2565.35]

1722.32 [1265.94, 2312.19]

1843.97 [1284.71, 2565.35]

2503.13 [1739.95, 3534.96]

0.003

Intraoperative massive blood loss (no/yes, %)

187/65 (74.2/25.8)

131/33 (79.9/20.1)

38/14 (73.1/26.9)

18/18 (50.0/50.0)

0.001

Length of hospital stay (days, median [IQR])

18.00 [14.00, 25.00]

18.00 [14.00, 24.00]

20.00 [15.00, 26.00]

20.50 [17.00, 33.00]

0.076

Length of hospital stay after surgery (days, median [IQR])

14.00 [11.00, 17.25]

13.00 [11.00, 16.00]

14.50 [12.00, 20.00]

13.50 [9.00, 20.00]

0.070

After propensity score analysis

     

n

132

74

31

27

 

Blood loss (mL, median [IQR])

1815.00 [1310.19, 2572.20]

1703.41 [1277.81, 2124.82]

1835.23 [1284.71, 2579.04]

2665.21 [1770.57, 3534.96]

0.007

Intraoperative massive blood loss (no/yes, %)

98/34 (74.2/25.8)

63/11 (85.1/14.9)

22/9 (71.0/29.0)

13/14 (48.1/51.9)

0.001

Length of hospital stay (days, median [IQR])

19.00 [14.00, 26.00]

19.00 [14.00, 26.00]

19.00 [15.00, 26.00]

18.00 [13.00, 23.00]

0.940

Length of hospital stay after surgery (days, median [IQR])

13.00 [9.75, 16.00]

13.00 [10.00, 16.00]

14.00 [12.00, 20.00]

11.00 [9.00, 14.00]

0.069

  1. IQR, Interquartile range