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Table 2 Inpatient utilisation volumes derived from THS vs administrative data

From: Under-reporting of inpatient services utilisation in household surveys – a population-based study in Hong Kong

  1999 2001 2002 Cohen's d effect size index on under-reporting§
  Admin data (a) Survey data (b) Net under-reporting 1- (b)/(a) Admin data (a) Survey data (b) Net under-reporting 1- (b)/(a) Admin data (a) Survey data (b) Net under-reporting 1- (b)/(a)    
           1999 vs 01 1999 vs 2002 2001 vs 2002
Comparator period May 1999 – Oct 1999 Sep – Nov 1999; last admission in past 6 months   Nov 2000 – Apr 2001 Jan – May 2001; last admission in past 6 months   Jul 2001 – Jun 2002 May – Jul 2002; all admissions in past 12 months     
No. of persons ever discharged from public hospitals 322,400 (295,974)* 205,039 36.4% (30.7%)* 345,029 (317,128)* 208,952 39.4% (34.1%)* 602,673 (546,793)* 337,868 43.9% (38.2%)* 1.64 3.88 2.20
Total no. of discharges from private hospitals 94,366 50,533 46.4% 98,693 51,285 48.0% 197,738 105,850 46.5% 0.49 0.007 0.59
  1. * After excluding non-residents and deceased patients as at 31 Oct 1999, 30 Apr 2001 and 30 June 2002 respectively for the 3 rounds of THS
  2. Assuming one hospital episode only for those who reported a last admission to a private hospital in the past 6 months
  3. §Cohen's for group 1 and 2 under comparison; where a = ad min istrative data, b = survey and