Table 3

Univariate and multivariate models of follow-up and blood pressure (BP) control
Modelling lack of follow-up visit (106 clinics; 6,993 patients)* Modelling hypertension (82 clinics; 5,057 patients)** Modelling unsustained normotension (75 clinics; 4,431 patients)***
Univariate analyses Multivariate hierarchical regression Univariate analyses Multivariate hierarchical regression Univariate analyses Multivariate hierarchical regression
Effect Statistic† (p-value) Point estimate (p-value) Statistic† (p-value) Point estimate (p-value) Statistic† (p-value) Point estimate (p-value)
Patient
Sex (ref=female) male χ2= 7.21 (0.03) 0.11 (0.3) χ2= 33.37 (<0.0001) 0.33 (<0.0001) χ2= 0.78 (0.68) N/A
Age -0.03 (<0.0001) -0.03 (<0.0001) -0.008 (<0.0001) -0.007 (0.0007) 0.01 (0.003) 0.01 (0.02)
Previous visits -0.27 (<0.0001) collinear with prev. SHT -0.07 (<0.0001) collinear with prev. SHT -0.03 (0.01) collinear with prev. SHT
Previous SHT -0.66 (<0.0001) -0.45 (0.0008) -0.09 (<0.0009) 0.17 (<0.0001) -0.21 (0.02) 0.16 (0.07)
Total CHOL/HDL (ref=unknown) >4.5 χ2= 69.70 (<0.0001) -1.23 (<0.0001) χ2= 30.16 (<0.0001) -0.05 (0.64) χ2= 0.20 (0.9) N/A
≤4.5 -1.05 (<0.0001) -0.32 (<0.0001) N/A
Diabetic Status (ref=no) yes χ2= 23.17 (<0.0001) -1.06 (0.0003) χ2= 0.98 (0.32) N/A χ2= 0.05 (0.83) N/A
New or change in medication (ref=no change) AT1 receptor blocker χ2=70.01 (<0.0001) -0.64 (<0.0001) χ2= 17.93 (0.02) -0.59 (0.01)
ACE inhibitor -0.39 (0.003) -0.24 (all others) (0.25)
Ca channel blocker 0.03 (0.88)
Beta blocker -0.34 (0.14)
Diuretics -0.48 (0.08)
Other single 0.07 (0.85)
Combination of 2 drugs -0.48 (<0.0001)
Combination of 3 drugs -0.68 (<0.0001)
GP
Sex (ref=male) female χ2= 1.23 (0.27) N/A χ2=1.84 (0.17) N/A χ2= 0.36 (0.55) N/A
Age -0.01 (0.08) collinear with years grad. -0.02 (0.6) collinear with years grad. -0.001 (0.85) collinear with years grad.
Years graduation -0.01 (0.05) 0.002 (0.75) -0.06 (0.07) 0.004 (0.33) 0.004 (0.55) N/A
Place graduation (ref=Australia) overseas χ2= 0.89 (0.35) N/A χ2=5.89 (0.01) -0.06 (0.54) χ2=1.47 (0.23) N/A
Clinic
Size -0.01 (0.45) N/A -0.02 (0.32) N/A -0.02 (0.25) N/A
Location (ref=Metropolitan) rural χ2= 0.14 (0.71) N/A χ2= 6.20 (0.01) 0.04 (0.72) χ2= 0.05 (0.82) N/A

*Only clinics with 20 or more patients were included in the analyses.

**Only clinics with 20 or more patients and patients with at least 1 BP measure were included in the analyses.

†Chi square test for categorical variables and logistic regression estimate for continuous variables.

Definitions: SHT=Severe hypertension; CHOL/HDL=Total cholesterol to high-density lipids ratio; AT1=Angiotensin 1; ACE=Angiotensin convertingenzyme; Ca=Calcium.

Gallego et al.

Gallego et al. BMC Health Services Research 2013 13:414   doi:10.1186/1472-6963-13-414

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