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. Author manuscript; available in PMC: 2020 Nov 2.
Published in final edited form as: Sleep Med. 2019 Mar 25;58:66–74. doi: 10.1016/j.sleep.2019.03.008

Table 4.

Independent association of predictors to sports-related concussion occurrence in multivariable models.

Predictor Odds ratio Standard error 95% CI p-value
Primary model
 High SRC prevalence sport participationa 3.240 1.671 1.193, 9.156 0.022
 Insomnia Severity Index score ≥15 3.047 1.782 0.929, 9.222 0.054
 Daytime sleepiness 2 + times per month 4.789 2.190 1.251, 31.623 0.046
Secondary model 1 (Total score model)
 High SRC prevalence sport participationa 3.291 1.667 1.218, 9.266 0.020
 Insomnia Severity Index total score 1.083 1.048 0.988, 1.189 0.088
 Daytime sleepiness 2 + times per month 4.357 2.200 1.122, 28.923 0.062
Secondary model 2 (Individual item model)
 High SRC prevalence sport participationa 3.012 1.691 1.081, 8.696 0.036
 Daytime sleepiness 2 + times per month 3.541 2.234 0.873, 23.956 0.116
 PSQI Item 9: Daytime motivation 2.409 1.381 1.305, 4.696 0.007

Abbreviations: SRC: sports-related concussion; PSQI: Pittsburgh Sleep Quality Index.

a

High SRC prevalence sports included football, soccer, and women’s basketball [50,51].