Table 7.
Regression analysis: effect of each predictor on TCI score (n = 249)
| Model | Fixed components | Random components | -2 log-likelihood | P† | |||||
|---|---|---|---|---|---|---|---|---|---|
| Parameter‡ | Estimate | 95% CI | P | Parameter | σ | 95% CI | |||
| Predictors measured at the level of the individual | |||||||||
| Baseline | Constant | 50.32 | 48.36, 52.28 | 0.00 | Practices | 3.08 | 1.38, 4.78 | 1788.02 | |
| Individuals | 8.49 | 7.72, 9.26 | |||||||
| Age (years) | Constant | 47.72 | 42.46, 52.98 | 0.00 | Practices | 3.07 | 1.38, 4.77 | 1786.94 | 0.30 |
| Age | 0.06 | -0.05, 0.16 | 0.30 | Individuals | 8.47 | 7.70, 9.24 | |||
| Gender* | Constant | 49.25 | 47.43, 51.07 | 0.00 | Practices | 2.67 | 1.09, 4.24 | 1767.71 | <0.001 |
| Male | 6.62 | 3.79, 9.46 | 0.00 | Individuals | 8.18 | 7.44, 8.92 | |||
| Tenure* (years) | Constant | 48.88 | 46.57, 51.20 | 0.00 | Practices | 3.19 | 1.48, 4.91 | 1782.28 | 0.02 |
| Tenure | 0.16 | 0.03, 0.29 | 0.02 | Individuals | 8.37 | 7.62, 9.13 | |||
| Sessions (per week) | Constant | 48.47 | 45.43, 51.50 | 0.00 | Practices | 3.20 | 1.47, 4.93 | 1785.49 | 0.11 |
| Session | 0.33 | -0.07, 0.73 | 0.11 | Individuals | 8.43 | 7.67, 9.19 | |||
| Professional role* | Constant | 55.04 | 52.24, 57.84 | 0.00 | Practices | 2.88 | 1.24, 4.51 | 1764.96 | <0.001 |
| Nurse | -7.66 | -11.27, -4.05 | 0.00 | Individuals | 8.11 | 7.38, 8.85 | |||
| Admin | -5.92 | -8.70, -3.15 | 0.00 | ||||||
| Community nurse | -5.90 | -9.89, -1.90 | 0.00 | ||||||
| Other | -3.33 | -7.02, -0.36 | 0.08 | ||||||
| Predictors measured at the level of the practice | |||||||||
| List size* | Constant (≤ 3500) | 52.45 | 49.73, 55.17 | 0.00 | Practices | 2.30 | 0.77, 3.83 | 1782.57 | 0.02 |
| 3501–7000 | -4.75 | -8.57, -0.93 | 0.02 | Individuals | 8.48 | 7.72, 9.25 | |||
| >7001 | -1.35 | -5.52, 2.82 | 0.53 | ||||||
| Number of General Practitioners* | Constant (1 or 2) |
53.97 | 49.76, 58.17 | 0.00 | Practices | 1.86 | 0.43, 3.28 | 1778.84 | 0.01 |
| 3–5 | -6.03 | -10.69, -1.37 | 0.01 | Individuals | 8.47 | 7.71, 9.23 | |||
| 6 or more | -1.23 | -6.12, 3.66 | 0.62 | ||||||
| Number of Practice Nurses | Constant (1 or 2) |
48.70 | 45.60, 51.80 | Practices | 2.48 | 0.80, 4.17 | 1784.79 | 0.20 | |
| 3–4 | 1.74 | -2.07, 5.54 | 0.37 | Individuals | 8.50 | 7.73, 9.27 | |||
| 5 or more | 6.43 | -0.07, 12.93 | 0.05 | ||||||
| Number of Admin staff | Constant (1–5) |
53.47 | 50.12, 56.83 | Practices | 2.52 | 1.01, 4.03 | 1783.59 | 0.11 | |
| 6–10 | -5.13 | -10.00, -0.27 | 0.04 | Individuals | 8.47 | 7.71, 9.24 | |||
| >10 | -3.86 | -8.01, -0.27 | 0.07 | ||||||
| Number of Staff | Constant (1–20) |
51.24 | 48.45, 54.03 | Practices | 2.91 | 1.24, 4.58 | 1787.00 | 0.31 | |
| 21–30 | -2.58 | -7.54, 2.39 | 0.31 | Individuals | 8.49 | 7.72, 9.26 | |||
| >30 | -1.13 | -5.44, 3.19 | 0.61 | ||||||
| Practice meeting | Constant (partners only) | 47.62 | 42.51, 52.74 | Practices | 2.81 | 1.20, 4.43 | 1786.06 | 0.37 | |
| Partners+ Admin |
6.47 | -2.57, 15.51 | 0.16 | Individuals | 8.48 | 7.72, 9.25 | |||
| Partners+admin +clinical | 2.85 | -2.67, 8.36 | 0.31 | ||||||
| CDM clinic | Constant (general clinic) | 47.62 | 42.51, 52.74 | Practices | 2.92 | 1.18, 4.65 | 1787.42 | 0.74 | |
| Step ladder cdm clinic | 1.75 | -3.16, 6.66 | 0.48 | Individuals | 8.50 | 7.73, 9.27 | |||
| General+specific condition | 1.40 | -2.94, 5.75 | 0.53 | ||||||
† When a predictor variable is included in the model, this p-value is generated by calculating the change in -2 log-likelihood from that of the baseline model and comparing it with the percentage points of the appropriate chi-squared distribution.
σ = standard deviation of TCI scores (either between practices or between individuals within practices as specified)
‡ In the case of a categorical variable the constant term corresponds to the estimated mean TCI score for respondents in the reference category (which is given in brackets).