From: Prediction models for clustered data: comparison of a random intercept and standard regression model
Distribution (N = 1642) | Interquartile range per anesthesiologist * | Standard model Beta (95% CI) † | Random intercept model Beta (95% CI) † | |
---|---|---|---|---|
Fixed effect | ||||
Female gender | 882 (54%) | 46%-63% | 0.75 (0.53 – 0.97) | 0.78 (0.54 – 1.01) |
Age, years ‡ | 49 (16.5) | 46-51 | -0.008 (-0.014 – -0.001) | -0.009 (-0.016 – -0.003) |
History of PONV or motion sickness | 530 (32%) | 30%-36% | 0.41 (0.19 – 0.64) | 0.42 (0.18 – 0.65) |
Current smoking | 510 (31%) | 20%-33% | -0.43 (-0.66 – -0.19) | -0.45 (-0.69 – -0.20) |
Abdominal or middle ear surgery | 209 (13%) | 4%-16% | 0.62 (0.32 – 0.93) | 0.57 (0.24 – 0.89) |
Volatile anesthetics | 844 (51%) | 33%-74% | -0.03 (-0.24 – 0.18) | 0.19 (-0.09 – 0.46) |
Intercept | 616 (38%) § | 29%-47% § | -0.65 (-1.05 – -0.25) | -0.68 (-1.16 – -0.19) |
Random effect | ||||
Intercept variance †† | - | - | - | 0.15 (0.07 – 0.33) |