Article Figures & Data
Tables
- Table 1
Poisson regression for the effect of season on dSSI rates over time (laminectomy and spinal fusion/revision fusion).
Period Patients (n = 22,568) No. of dSSI (n = 225) dSSI Rate (%) Rate Ratio (95% CI)a P Value Overall 22,568 225 0.99 0.91 (0.87, 0.95) <0.01 Season Summer (reference variable) 5868 66 1.12 --- -- Fall 5081 40 0.79 0.67 (0.45, 0.99) 0.05 Winter 5552 55 0.99 0.87 (0.61, 1.25) >0.05 Spring 6067 64 1.05 0.94 (0.61, 1.25) >0.05 Abbreviation: dSSI, deep surgical site infection.
Note: Boldface indicates statistically significant findings.
↵a Rate ratio obtained from Poisson regression.
- Table 2
Poisson regression for the effect of season on dSSI rates over time (laminectomy).
Time Period Patients (n = 7931) No. of dSSI (n = 38) dSSI Rate (%) Rate Ratio (95% CI)a P Value Overall 7931 38 0.48 1.02 (0.90, 1.15) >0.05 Season Summer (reference variable) 2088 15 0.72 --- -- Fall 1725 8 0.46 0.65 (0.28, 1.54) >0.05 Winter 1952 8 0.41 0.57 (0.24, 1.35) >0.05 Spring 2166 7 0.32 0.45 (0.18, 1.10) >0.05 Abbreviation: dSSI, deep surgical site infection.
↵a Rate ratio obtained from Poisson regression.
- Table 3
Poisson regression for the effect of season on dSSI rates over time (spinal fusion/revision fusion).
Period Patients (n = 14,637) No. of dSSI (n = 180) dSSI Rate (%) Rate Ratio (95% CI)a P Value Overall 14,637 180 1.23 0.89 (0.84, 0.94) <0.01 Season Summer (reference variable) 3780 50 1.32 --- --- Fall 3356 29 0.86 0.62 (0.39, 0.98) <0.05 Winter 3600 47 1.31 0.98 (0.66, 1.46) >0.05 Spring 3901 54 1.38 1.05 (0.71, 1.54) >0.05 Abbreviation: dSSI, deep surgical site infection.
Note: Boldface indicates statistically significant findings.
↵a Rate ratio obtained from Poisson regression.
- Table 4
Poisson regression for the effect of month on dSSI rates over time (laminectomy and fusion/revision fusion).
Period Patients (n = 22,568) No. of dSSI (n = 225) dSSI Rate (%) Rate Ratio (95% CI)a P Value Overall 22,568 225 0.99 0.90 (0.86, 0.94) <0.01 Month July (reference variable) 1882 21 1.12 --- --- January 2039 22 1.08 1.09 (0.60, 1.98) >0.05 February 1895 17 0.89 0.91 (0.48, 1.73) >0.05 March 2107 17 0.81 0.79 (0.42, 1.51) >0.05 April 1944 22 1.13 1.35 (0.74, 2.45) >0.05 May 2016 25 1.24 1.11 (0.62, 1.99) >0.05 June 2052 23 1.12 1.05 (0.58, 1.90) >0.05 August 1897 22 1.16 1.13 (0.62, 2.06) >0.05 September 1642 16 0.97 1.04 (0.54, 1.99) >0.05 October 1764 13 0.74 0.62 (0.31, 1.24) >0.05 November 1675 11 0.66 0.82 (0.40, 1.70) >0.05 December 1618 16 0.99 0.92 (0.48, 1.76) >0.05 Abbreviation: dSSI, deep surgical site infection.
Note: Boldface indicates statistically significant findings.
↵a Rate ratio obtained from Poisson regression.
Period Patients (n = 7931) No. of dSSI (n = 128) dSSI Rate (%) Rate Ratio (95% CI)a P Value Overall 7931 128 1.64 1.02 (0.90, 1.15) >0.05 Month July (reference variable) 766 7 0.91 --- --- January 590 1 0.17 0.15 (0.02, 1.26) >0.05 February 674 3 0.45 0.46 (0.12, 1.76) >0.05 March 784 1 0.13 0.15 (0.02, 1.21) >0.05 April 678 2 0.29 0.39 (0.08, 1.90) >0.05 May 704 4 0.57 0.63 (0.18, 2.15) >0.05 June 734 4 0.54 0.53 (0.16, 1.82) >0.05 August 672 4 0.59 0.68 (0.20, 2.31) >0.05 September 550 4 0.73 0.78 (0.23, 2.65) >0.05 October 625 1 0.16 0.17 (0.02, 1.38) >0.05 November 550 3 0.55 0.83 (0.21, 3.20) >0.05 December 604 4 0.66 0.71 (0.21, 2.45) >0.05 Abbreviation: dSSI, deep surgical site infection.
↵a Rate ratio obtained from Poisson regression.
- Table 6
Poisson regression for the effect of month on dSSI rates over time (spinal fusion).
Period Patients (n = 15,376) No. of dSSI (n = 176) dSSI Rate (%) Rate Ratio (95% CI)a P Value Overall 15,376 176 1.14 0.88 (0.84, 0.93) <0.01 Month July (reference variable) 1200 14 1.17 --- --- January 1150 22 1.91 1.49 (0.76, 2.94) >0.05 February 1264 14 1.11 1.13 (0.54, 2.38) >0.05 March 1323 15 1.13 1.16 (0.56, 2.41) >0.05 April 1266 20 1.56 1.86 (0.94, 3.68) 0.04 May 1312 19 1.40 1.35 (0.68, 2.70) >0.05 June 1355 19 1.36 1.34 (0.67, 2.66) >0.05 August 1225 17 1.39 1.48 (0.73, 3.01) >0.05 September 1092 12 1.10 1.17 (0.54, 2.53) >0.05 October 1139 11 0.97 0.91 (0.41, 2.00) >0.05 November 1125 6 0.53 0.76 (0.29, 1.98) >0.05 December 1014 12 1.18 1.05 (0.49, 2.28) >0.05 Abbreviation: dSSI, deep surgical site infection.
Note: Boldface indicates statistically significant findings.
↵a Rate ratio obtained from Poisson regression.
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