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Mean satisfaction (Y..)

67-7 (23-5)

*The range in physician-level means (Y.j) is 53-4 to 871

'The range in physician-level standard deviations (Sj) is 13-4 to 32-4

*The range in physician-level means (Y.j) is 53-4 to 871

'The range in physician-level standard deviations (Sj) is 13-4 to 32-4

There are 70 primary care physicians in the analysis (J = 70). Physician-level mean satisfaction scores, Y.j, range from 53-4 to 87-1 (see Table III), and the mean of the physician-level means is 68-5. Physician-level standard deviations in satisfaction scores, which are assumed to be homogeneous, range from 13-4 to 32-4 and have a mean of 22-7.

Before fitting a two-level hierarchical model, we performed a fully stratified analysis, in which we developed separate regression equations relating patient satisfaction to patient age in each physician's practice, considered separately. The ordinary least squares (OLS) estimates of the intercepts and slopes for each physician practice are displayed in Table IV. The numbers of patients in each physician practice, rij are also shown. Since the level 1 covariate X — patient age, was centred about its grand mean (X..), the estimated intercepts (/?0j) are interpreted as the mean satisfaction scores for each physician adjusted for patient age. There is substantial variation in the adjusted mean satisfaction scores among physicians which range from 54 0 to 87-9. Figure 3 displays the relationship between the OLS estimates of the intercepts and slopes. There is a very

Figure 2. Distribution of patient satisfaction scores in pooled sample (n = 1492). Minimum = 0, Ql = 50, median — 71-4, Q3 = 87-5, maximum = 100. Mean satisfaction Y.. = 67-7, s = 23-5

Table IV. Ordinary least squares (OLS) estimates of intercepts and slopes: results of fully stratified analysis

Physician

Number of

OLS ^

OLS,

identification

patients (n})

intercept {¡¡oj)

slope ($u)

number

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