Odds ratios (95% confidence intervals) for being in a higher prescribing cost category obtained from multivariable proportional odds model (n=967 samples)
| Odds ratio | 95% CI | p value* | |
|---|---|---|---|
| *Adjusted Wald test. | |||
| log (LISI) | 3.86 | (2.35 to 6.34) | <0.01 |
| Sex (female v male) | 0.88 | (0.47 to 1.65) | 0.69 |
| Dispensing status (yes v no) | 4.93 | (1.88 to 12.9) | <0.01 |
| Are you a GP trainer (yes v no) | 0.38 | (0.24 to 0.60) | <0.01 |
| Length of service (GP) | |||
| (base <5 years) | – | ||
| 5–10 years | 0.91 | (0.22 to 3.78) | 0.09 |
| 11–20 years | 0.71 | (0.17 to 2.89) | 0.09 |
| >20 years | 4.31 | (0.87 to 21.3) | 0.09 |
| Single handed (yes v no) | 0.41 | (0.23 to 0.76) | <0.01 |
| Interaction 1: sex × length of service | |||
| Female, 5–10 years | 1.06 | (0.47 to 2.37) | <0.01 |
| Female, 11–20 years | 0.37 | (0.17 to 0.82) | <0.01 |
| Female, >20 years | 1.22 | (0.51 to 2.92) | <0.01 |
| Interaction 2: log (LISI) × length of service | |||
| log (LISI), 5–10 years | 1.29 | (0.72 to 2.32) | <0.01 |
| log (LISI), 11–20 years | 1.55 | (0.88 to 2.72) | <0.01 |
| log (LISI), >20 years | 0.55 | (0.28 to 1.07) | <0.01 |