Table 5.
Effect of Guided Care on Physicians’ Ratings of Chronic Care Processes: Regression Coefficients and Effect Sizes in Linear Regression Models
| Variable | ICCa | Coefficientb (95% CI) | Effect Sizec (95% CI) |
|---|---|---|---|
| CI=confidence interval, ICC = intraclass correlation. | |||
| aICCs are not shown if the variance within sites is larger than the variance between sites and the values of ICC become artificially low or negative.25 | |||
| bRegression coefficient of Guided Care in linear regression models of 1-year scores, adjusting for baseline scores and practice ownership. | |||
cCalculated using Hedges’ d as follows:
 .
where n1 and n2 are sample sizes of 2 comparison groups, and
where n1 and n2 are the numbers of sample size in 2 groups and df is the degrees of freedom used for a corresponding t value in a linear model.
95% CI = ES− 1:96se to ES+1:96se; where ES stands for effect size and se is the asymptotic standard error for the effect size:
 | |||
| d ρ <0.05. | |||
| Satisfaction with patient/family communication | 0.06 | 0.59 (0.13 to 1.06)d | 0.87 (0.21 to 1.54) |
| Satisfaction with management of chronic care | 0.25 | 0.23 (−0.20 to 0.66) | 0.37 (−0.28 to 1.01) |
| Time spent managing chronically ill patients | – | 0.12 (−0.35 to 0.60) | 0.18 (−0.46 to 0.82) |
| Knowledge of patients’ personal circumstances | – | 0.05 (−0.22 to 0.31) | 0.12 (−0.52 to 0.76) |
| Knowledge of patients clinical characteristics | 0.33 | 0.32 (0.01 to 0.63)* | 0.71 (0.05 to 1.37) |
| Knowledge about all the special visits | 0.37 | 0.07 (−0.37 to 0.52) | 0.12 (−0.52 to 0.76) |
| Helped appointment for referral visit | – | 0.57 (−0.07 to 1.20) | 0.61 (−0.04 to 1.26) |
| Written information to patients’ specialists | 0.14 | 0.54 (−0.20 to 1.29) | 0.50 (−0.15 to 1.15) |
| Useful information received from specialists | 0.20 | 0.27 (−0.13 to 0.68) | 0.46 (−0.19 to 1.10) |