Environmental, store, machine, and task factors associated with airborne pollutants*
| IPM ln (mg/m3) | Endotoxin ln (EU/m3) | Viable fungi ln (CFU/m3) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Coefficient | p | Partial R2 | Coefficient | p | Partial R2 | Coefficient | p | Partial R2 | |
| *Coefficients, p values, partial correlation coefficients from multiple linear regression models including each of the variables for which coefficient values are shown. | |||||||||
| †These two types of machines are the only types that required manual raking of the broken glass cone. | |||||||||
| Intercept | −3.3 | <0.001 | −2.01 | <0.001 | 4.4 | <0.001 | |||
| Environmental characteristics | |||||||||
| Median income in neighbourhood ($K) | 0.015 | <0.001 | 3.6 | 0.023 | <0.001 | 2.4 | |||
| Outdoor IPM (log, mg/m3) | 0.14 | <0.001 | 6.8 | ||||||
| Indoor IPM (log mg/m3) | 0.81 | <0.001 | 20.9 | ||||||
| Outdoor fungi (log CFU/m3) | 0.21 | <0.001 | 2.5 | ||||||
| Absolute humidity indoors (lb water per lb air × 100) | −1.69 | <0.001 | 3.8 | 1.38 | 0.003 | 4.5 | |||
| Store characteristics | |||||||||
| Store situated below grade (yes/no) | 0.82 | <0.01 | 2.4 | 0.77 | 0.002 | 3.2 | |||
| Crowded warehouse (yes/no) | −0.34 | 0.002 | 0.4 | ||||||
| Receives empties in bulk (e.g. from bars) (yes/no) | 2.0 | <0.001 | 1.9 | ||||||
| No. wine bottles returned, prior month (<20K/20–40K/>40K) | −0.71 | <0.001 | 0.1 | ||||||
| Machine characteristics | |||||||||
| Hydraulic rotary conveyor† | 2.58 | <0.001 | 12.5 | ||||||
| Rotary conveyor† | 0.78 | <0.001 | 1.1 | ||||||
| Machine steam cleaned, past month (yes/no) | −0.47 | 0.001 | 0.5 | ||||||
| Characteristics related to recycling activities | |||||||||
| Local exhaust always on (yes/no) | −0.14 | 0.06 | 1.1 | ||||||
| Visually mouldy bottles being broken (yes/no) | 1.09 | <0.001 | 21.3 | ||||||
| Glass bins covered (yes/no) | −0.68 | 0.005 | 0.7 | ||||||
| Employee tasks | |||||||||
| Stocking shelves (% of day) | 0.010 | <0.001 | 3.1 | ||||||
| Handling pallets/boxes in warehouse (% of day) | 0.008 | <0.001 | 5.0 | 0.006 | 0.07 | 1.1 | |||
| Empties/breaking (% of day) | 0.006 | <0.05 | 1.4 | 0.010 | 0.02 | 1.6 | |||
| Smoker (yes/no) | 0.28 | 0.03 | 1.3 | ||||||
| Model R† | 0.21 | 0.31 | 0.52 | ||||||