Full segmented regression models predicting mean quarterly number of cataract operations
| Variable* | Parameter estimate (95% CI) |
|---|---|
| Recent graduates | |
| Intercept, β0 | 197.54 (8.7 to 386.33) |
| Baseline trend, β1 | 1.39 (1.04 to 1.74) |
| Level change after Jan. 1, 2007, β2 | −46.37 (−62.73 to −30.00) |
| Trend change after Jan. 1, 2007, β3 | −1.62 (−2.51 to −0.73) |
| No. of ophthalmologists/100 000 population ≥ 18 yr of age, β4 | −27.98 (−58.86 to 2.89) |
| Established ophthalmologists | |
| Intercept, β0 | 45.96 (−38.91 to 130.83) |
| Baseline trend, β1 | 1.50 (1.34 to 1.66) |
| Level change after Jan. 1, 2007, β2 | 5.89 (−1.47 to 13.24) |
| Trend change after Jan. 1, 2007, β3 | −1.68 (−2.08 to −1.28) |
| No. of ophthalmologists/100 000 population ≥ 18 yr of age, β4 | 0.15 (−13.73 to 14.03) |
Note: CI = confidence interval
↵* β0 = estimate of the adjusted quarterly cataract surgery rate at baseline (first quarter of 1994); β1 = estimate of the adjusted baseline slope parameter representing the change in the cataract surgery rate that occurred every quarter before January 2007; β2 = estimate of the adjusted immediate shift in the cataract surgery rate occurring as of January 2007; β3 = estimate of the adjusted change in the trend (slope) of the cataract surgery rate occurring as of January 2007; β4 = estimate of the effect of the number of ophthalmologists per population on the mean cataract surgical rate.