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The Huber-White sandwich estimator of variance was used to produce standard errors corrected for intragroup (facility) correlation of measures.
These regression models account for the within medical facility correlation between patients and within person correlation among repeated measurements, for valid estimation of treatment effects and associated standard errors.
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Robust standard errors with clustering were calculated to take into account within-facility correlation [ 32].
Corresponding facility intraclass correlation coefficient (ICC) was 9.17e−20, with 0 standard error.
Similarly, intention was significantly and positively associated with attitude, subjective norm and descriptive norm among women attending private health care facility (the correlation below the diagonal in Table 3).
In the intervention facilities, a correlation was found between frequency of supervision and improvements in performance.
Within facilities, the correlation between the number of hospital and ICU visitation restrictions was moderate (correlation coefficient, 0.39).
Age and the time the health worker had worked in their current facility had a correlation of 0.24.
Intention was significantly and positively associated with attitude, subjective norm, descriptive norm, PMTCT knowledge, previous HIV testing experience and previous HIV testing experience with partner among public health care facility attendees (the correlation above the diagonal in Table 3).
Residential satisfaction index has high positive correlations with dwelling unit features, social environment, support services and public facilities, and low positive correlation with neighbourhood facilities.
GDP per capita, PPP (current international $) and Improved sanitation facilities have strong correlation (0.744). 4.
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