Table 2.
Final multiple regression model of log-transformed cTVOC concentrations summarizing the posterior distributions from the MCMC chains of model parameters for covariates and random effects.
| Variable | N | Mean (α or β) (% change) |
Median (α or β) (% change) |
α or β (95% CI) |
Median SD (95% CI) |
|
|---|---|---|---|---|---|---|
| Main fixed effects | No product (intercept) | 7993 | 8.05 | 7.96 | 7.63, 8.86 | 0.29 (0.28, 0.94) |
| Alcohol skin wipe | 232 | −0.08 (−8.1) | −0.08 (−7.7) | −0.24, 0.05 | 0.66 (0.55, 1.26) | |
| Alcohol surface cleaning | 38 | 0.02 (1.9) | 0.02 (2.1) | −0.4, 0.46 | 0.55 (0.37, 1.14) | |
| Bleach surface cleaning | 46 | −0.16 (−14.4) | −0.14 (−13.4) | −0.37, 0.02 | 0.12 (0.07, 0.57) | |
| Chlorine skin wipe | 39 | 0.14 (15.2) | 0.16 (17.2) | −0.16, 0.35 | 0.19 (0.12, 0.84) | |
| Dental products | 9 | 0.3 (35.3) | 0.27 (30.8) | −0.27, 1.07 | 0.34 (0.16, 1.17) | |
| Detergent bathroom cleaning | 27 | −0.17 (−15.4) | −0.18 (−16.6) | −0.56, 0.27 | 0.7 (0.44, 1.26) | |
| Detergent instrument cleaning | 64 | −0.15 (−14.2) | −0.14 (−13.5) | −0.5, 0.13 | 0.25 (0.13, 1.07) | |
| Detergent skin cleaning | 3 | −0.27 (−23.3) | −0.29 (−25.0) | −0.61, 0.1 | 0.04 (0.02, 0.15) | |
| Detergent surface cleaning | 17 | 0.04 (4.4) | 0.01 (1.1) | −0.19, 0.46 | 0.1 (0.08, 1.1) | |
| EA/BA/GE floor stripping | 206 | −0.04 (−4) | −0.03 (−3.3) | −0.23, 0.11 | 0.47 (0.38, 1.67) | |
| EA/GE/ glass cleaning | 62 | 0.04 (4.2) | 0.01 (1.3) | −0.24, 0.41 | 0.18 (0.13, 0.84) | |
| EA/GE surface cleaning | 51 | −0.17 (−15.7) | 0.04 (4.2) | −1.06, 0.27 | 0.27 (0.17, 1.1) | |
| Enzymatic cleaning | 149 | 0.19 (21.4) | 0.13 (13.4) | −0.03, 0.58 | 0.16 (0.13, 0.73) | |
| Formaldehyde in laboratory | 26 | −0.78 (−54) | −0.75 (−52.8) | −1.36, −0.22 | 0.32 (0.21, 0.7) | |
| HLD on instruments | 40 | 0.29 (33.3) | 0.28 (31.9) | −0.22, 0.81 | 0.71 (0.49, 1.4) | |
| Iodine skin wipe | 36 | −0.27 (−23.9) | −0.3 (−25.8) | −0.58, 0.15 | 0.39 (0.19, 1.38) | |
| Non-cleaning-other product | 192 | −0.1 (−9.3) | −0.08 (−7.6) | −0.32, 0.05 | 0.32 (0.26, 1.03) | |
| Non-cleaning-dialysis buffer | 7 | 0.22 (25.2) | 0.2 (22.4) | −0.12, 0.74 | 0.14 (0.08, 1.15) | |
| Non-cleaning-lab reagent | 28 | 0.24 (27.6) | 0.22 (24.7) | −0.14, 0.7 | 0.2 (0.12, 0.64) | |
| Non-cleaning-medications | 63 | −0.03 (−3.3) | −0.02 (−2.1) | −0.33, 0.19 | 0.36 (0.25, 1.29) | |
| Phenolics products | 109 | −0.09 (−8.4) | −0.06 (−6.2) | −0.38, 0.09 | 0.2 (0.13, 0.99) | |
| Quats bathroom cleaning | 14 | −0.39 (−32.5) | −0.33 (−28.0) | −1.12, 0.03 | 0.16 (0.09, 1.5) | |
| Quats floor cleaning | 346 | −0.06 (−5.9) | −0.05 (−5.0) | −0.24, 0.06 | 0.12 (0.1, 0.48) | |
| Quats skin wipe | 23 | 0.82 (126.2) | 0.78 (119.0) | 0.25, 1.45 | 0.34 (0.2, 0.86) | |
| Quats surface cleaning | 450 | −0.02 (−1.8) | −0.02 (−1.7) | −0.16, 0.11 | 0.36 (0.31, 1.07) | |
| Solvent products | 6 | −0.01 (−1.2) | 0.06 (6.1) | −0.96, 0.44 | 0.15 (0.09, 1.57) | |
| Covariates | Local exhaust hood: present | 171 | −0.11 (−10.7) | −0.14 (−13.4) | −0.33, 0.26 | |
| Local exhaust hood: N/A | 1843 | 0 (0.2) | 0 (0.2) | −0.06, 0.06 | ||
| Sampler distance >3 ft | 4688 | −0.02 (−1.7) | −0.02 (−1.6) | −0.07, 0.03 | ||
| Room volume: large | 2971 | −0.13 (−11.8) | −0.12 (−11.2) | −0.25, −0.02 | ||
| Room volume: N/A | 5745 | −0.12 (−11.1) | −0.11 (−10.8) | −0.21, −0.03 | ||
| Tool—spray & sponge: sponge only | 655 | 0.02 (1.8) | 0.02 (2.3) | −0.09, 0.12 | ||
| Tool—spray & sponge: spray only | 33 | 0.2 (22.3) | 0.19 (20.6) | −0.08, 0.57 | ||
| Tool—spray & sponge: sponge & spray | 150 | 0.08 (8.4) | 0.08 (8.3) | −0.04, 0.21 | ||
| Tool—spray & sponge: N/A | 8892 | −0.08 (−7.5) | −0.05 (−4.85) | −0.29, 0.07 | ||
| Automatic sterilizer | 69 | −0.46 (−37.1) | −0.46 (−36.8) | −0.9, −0.1 | ||
| Automatic sterilizer: N/A | 10 106 | −0.33 (−28.4) | −0.28 (−24.2) | −0.67, −0.14 | ||
| Humidity | −0.01 (−1.3) | −0.01 (−1.3) | −0.02, −0.01 | |||
| SD | Spline (σζ): median (95% CI) | 1.2 (0.02, 1.24) | ||||
| Random (σα): median (95% CI) | 1.0 (0.88, 1.13) |
N = number of 5-min average measurements; α = posterior parameter for task; β = posterior parameter for covariates; %change = (exp(α) − 1)*100% for tasks or (exp(β) − 1)*100% for covariates; EA/BA/GE = ethanolamines/benzyl alcohols/glycol ethers; EA/GE = ethanolamines/glycol ethers; N/A = variable not relevant.