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Table 3 Quarterly means, standard deviations (s.d), correlations among patient-level SQUIDs

From: Using a summary measure for multiple quality indicators in primary care: the Summary QUality InDex (SQUID)

Quarter

Mean1 (s.d.) patient-level SQUID (n = 212,054)

Mean2 (s.d.) patient-level SQUID [n]

Mean (s.d.) practice-level SQUID (n = 85)

Third quarter 2004

40.0% (20.1%)

35.1% (20.7%) [324,595]

34.8% (10.9%)

Fourth quarter 2004

41.3% (19.9%)

34.8% (20.8%) [355,381]

35.1% (10.6%)

First quarter 2005

42.5% (19.8%)

35.5% (21.0%) [360,682]

36.1% (10.5%)

Second quarter 2005

43.3% (19.7%)

36.4% (21.0%) [362,712]

37.0% (10.5%)

Third quarter 2005

43.6% (19.8%)

38.3% (21.0%) [330,966]

38.6% (10.6%)

  1. 1 Mean SQUID among 212,054 patients active throughout entire study period
  2. 2 Mean SQUID among patients active during the quarter of interest
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