Rate ratios (RR) and their 95% CI from univariate and multivariate regression models modelling the rate of slipping with within-restaurant area-level perception of slipperiness
| Univariate | Multivariate | Sensitivity analysis | ||||
|---|---|---|---|---|---|---|
| RR | 95% CI | RR | 95% CI | RR | 95% CI | |
| Mean area-level perception of slipperiness (1 point)* | 3.13 | 2.54 to 3.86 | 2.92 | 2.41 to 3.54 | 3.88 | 3.21 to 4.69 |
| Mean coefficient of friction (0.1)* | 0.75 | 0.60 to 0.94 | 0.75 | 0.61 to 0.92 | ||
| Slip-resistant shoes | ||||||
| Yes* | 0.51 | 0.35 to 0.75 | 0.49 | 0.34 to 0.72 | ||
| No | 1 | – | 1 | – | ||
| Age (10 years)* | 0.71 | 0.59 to 0.85 | 0.70 | 0.58 to 0.84 | ||
| Body mass index (5 units | 0.99 | 0.86 to 1.14 | 0.95 | 0.82 to 1.10 | ||
| Gender | ||||||
| Men | 1.06 | 0.74 to 1.52 | 1.15 | 0.80 to 1.64 | ||
| Women | 1 | – | 1 | |||
| Job tenure (12 months | 0.96 | 0.91 to 1.02 | 0.96 | 0.91 to 1.02 | ||
| Education | ||||||
| Never attended | 0.18 | 0.02 to 1.52 | 0.20 | 0.03 to 1.54 | ||
| Grades 1–11 | 1.00 | 0.67 to 1.50 | 1.01 | 0.67 to 1.53 | ||
| High school grad/GED | 0.92 | 0.61 to 1.39 | 0.85 | 0.56 to 1.29 | ||
| Some college and above | 1 | – | 1 | |||
| Language | ||||||
| Portuguese | 0.40 | 0.07 to 2.42 | 0.46 | 0.07 to 3.09 | ||
| Spanish* | 0.27 | 0.10 to 0.72 | 0.25 | 0.09 to 0.68 | ||
| English | 1 | – | 1 | – | ||
| Chain | ||||||
| Chain 1 | 0.73 | 0.42 to 1.27 | 0.78 | 0.44 to 1.36 | ||
| Chain 2* | 0.67 | 0.45 to 0.98 | 0.67 | 0.46 to 1.00 | ||
| Chain 3 | 1 | – | 1 | – | ||
Note: Limited-service restaurant workers, 2007–2008.
*Significant at α level of 0.05.