Table 2 Inpatient utilisation volumes derived from THS vs administrative data
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 |
- * 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
- †Assuming one hospital episode only for those who reported a last admission to a private hospital in the past 6 months
- §Cohen's
for group 1 and 2 under comparison; where a = ad min istrative data, b = survey and 
for group 1 and 2 under comparison; where a = ad min istrative data, b = survey and 