Table 3.
Regression coefficients for cataract repair
| 1997-2000 | 2001-4 | 2005-7 | ||||||
|---|---|---|---|---|---|---|---|---|
| β coefficient (95% CI) | T statistic | β coefficient (95% CI) | T statistic | β coefficient (95% CI) | T statistic | |||
| Deprivation fifth: | ||||||||
| 2 | 3.18 (2.04 to 4.33)*** | 5.44 | 2.28 (1.54 to 3.02)*** | 6.02 | −0.57 (−0.93 to −0.20)** | −3.03 | ||
| 3 | 5.28 (4.14 to 6.43)*** | 9.05 | 3.81 (3.07 to 4.56)*** | 10.02 | 0.13 (−0.24 to 0.51) | 0.69 | ||
| 4 | 6.27 (5.11 to 7.43)*** | 10.58 | 2.56 (1.80 to 3.31)*** | 6.61 | −0.52 (−0.91 to −0.14)** | −2.7 | ||
| 5 | 3.97 (2.78 to 5.16)*** | 6.55 | −5.53 (−6.31 to −4.76)*** | −13.98 | −3.52 (−3.90 to −3.13)*** | −17.92 | ||
| Female sex | 12.75 (12.06 to 13.44)*** | 36.19 | 9.14 (8.69 to 9.60)*** | 39.59 | 3.63 (3.41 to 3.86)*** | 31.62 | ||
| Age: | ||||||||
| 50s | −2.43 (−4.26 to −0.59)* | −2.59 | −10.05 (−11.28 to −8.83*** | −16.09 | −3.70 (−4.345 to −3.06)*** | −11.28 | ||
| 60s | 14.77 (13.30 to 16.24)*** | 19.72 | 0.23 (−0.77 to 1.23) | 0.46 | −2.89 (−3.42 to −2.35)*** | −10.63 | ||
| 70s | 24.73 (23.41 to 26.06)*** | 36.64 | 8.62 (7.70 to 9.53)*** | 18.44 | −2.04 (−2.54 to −1.54)*** | −8.01 | ||
| 80s | 27.83 (26.49 to 29.18)*** | 40.54 | 14.41 (13.48 to 15.34)*** | 30.41 | 0.39 (−0.11 to 0.90) | 1.52 | ||
| Year: | ||||||||
| 1998 | 0.15 (-0.99 to 1.28) | 0.26 | NA | NA | NA | NA | ||
| 1999 | −4.15 (−6.28 to −2.02)*** | −3.84 | NA | NA | NA | NA | ||
| 2000 | −5.74 (−7.04 to −4.44)*** | −8.67 | NA | NA | NA | NA | ||
| 2002 | NA | NA | −3.39 (−4.13 to −2.64)*** | −8.90 | NA | NA | ||
| 2003 | NA | NA | −20.75 (−21.45 to −20.05)*** | −58.34 | NA | NA | ||
| 2004 | NA | NA | −75.34 (−75.97 to −74.71)*** | −234.55 | NA | NA | ||
| 2006 | NA | NA | NA | NA | −0.99 (−1.27 to −0.71)*** | −6.95 | ||
| 2007 | NA | NA | NA | NA | −0.80 (−1.09 to −0.51)*** | −5.46 | ||
| Observations | 703 827 | NA | 1 049 919 | NA | 814 572 | NA | ||
| R2 | 0.0250 | NA | 0.093 | NA | 0.006 | NA | ||
NA=not applicable.
Model run with robust standard errors; deprivation fifth 1 serves as reference category for deprivation, male is reference category for sex, and under 50 years is reference category for age; model also controls for area type (city, town, hamlet and isolated dwelling, village) and provider type (private, foundation trust, teaching hospital, specialist hospital, traditional NHS); dependent variable=waiting time for cataract repair, measured in days.
*P<0.05.
**P<0.01.
***P<0.001.