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Table 2 Descriptive parameters of demographic, morbidity and treatment variables with design effects (Deff), intra-cluster correlation coefficients (ICC) and standard errors of ICC (SE) for sample year April 1999 to March 2000 (N = 1,047 general practitioners): compared with ICC and SE for sample April 2002 to March 2003 (N = 1,008 GPs).

From: Observed intra-cluster correlation coefficients in a cluster survey sample of patient encounters in general practice in Australia

  1999–2000 (N = 1,047 GPs) 2002–2003 (1,008 GPs)
Parameter Estimate(SE) Deff (a) ICC(SE) Estimate ICC(SE)
Demographics      
Sex (% female) 59.0 (.39) 6.4 .055 (.003) 59.3 .066 (.003)
Age (years) – mean 44.5 (.31) 16.6 .159 (.006) 45.4 .153 (.006)
Holds health care card (%) 40.1 (.70) 21.4 .206 (.007) 42.7 .209 (.008)
Patient language (c) (%) 7.0 (.53) 45.6 .451 (.011) 8.8 .423 (.011)
Morbidity      
Number of problems (per 100 encounters) 149.5 (.86) 13.6 .127 (.005) 148.7 .141 (.006)
Problem by ICPC-2 chapter (b)      
Cardiovascular (%) 15.2 (.29) 6.7 .057 (.003) 15.3 .056 (.003)
Respiratory (%) 21.0 (.26) 4.2 .032 (.002) 19.0 .040 (.002)
Psychological (%) 10.6 (.25) 6.8 .059 (.003) 10.6 .061 (.003)
Endocrine/Metabolic (%) 8.8 (.18) 4.2 .032 (.002) 10.1 .031 (.002)
Blood (%) 1.7 (.08) 3.7 .027 (.002) 1.4 .007 (.001)
Digestive (%) 9.6 (.12) 1.8 .008 (.001) 9.7 .010 (.001)
Eye (%) 2.8 (.06) 1.5 .005 (.001) 2.6 .003 (.001)
Musculoskeletal (%) 16.3 (.23) 4.1 .032 (.002) 16.5 .045 (.002)
Skin (%) 16.1 (.19) 2.7 .017 (.001) 15.9 .042 (.002)
General unspecified (%) 14.0 (.22) 4.3 .034 (.002) 15.8 .043 (.002)
Treatment (% of encounters)      
Any medications 67.0 (.37) 6.6 .056 (.003) 64.4 .068 (.003)
Any referrals 11.2 (.20) 4.1 .031 (.002) 12.0 .033 (.002)
Any pathology tests ordered 14.7 (.26) 5.8 .048 (.002) 16.0 .046 (.002)
Any imaging tests ordered 6.9 (.15) 3.8 .028 (.002) 7.8 .029 (.002)
  1. (a) Average number of observations per cluster k = 100, except age (k = 99.2) and sex (k = 98.8).
  2. (b) Per cent of encounters where at least one problem from the chapter was managed.
  3. (c)Patient speaks a language other than English at home.