Association between clinic physician workforce and avoidable readmission: a retrospective database research

Table 4 Results of sensitivity analysis in which the region-level variables were represented by dummy variables disaggregated by five quintiles in each of the secondary medical service areas

	Readmissions for ACSCs within 30 days		Readmissions for ACSCs within 90 days
	Adjusted odds ratio (95% CI)	P	Adjusted odds ratio (95% CI)	P
FTEs of clinic physicians per 100,000 population
1st quintile	Reference		Reference
2nd quintile	0.89 (0.79–1.01)	0.081	0.89 (0.79–1.00)	0.046
3rd quintile	0.91 (0.80–1.03)	0.141	0.88 (0.78–0.99)	0.028
4th quintile	0.80 (0.70–0.91)	0.001	0.81 (0.72–0.91)	0.001
5th quintile	0.85 (0.75–0.97)	0.017	0.85 (0.75–0.96)	0.007

Odds ratios were adjusted for age-group (65–74 years, 75–84 years, 85–94 years, and ≥ 95 years), gender, body mass index, Barthel Index at discharge, surgery, length of stay, plan of home care program at discharge, 19 comorbidities, FTEs of hospital physicians per 100,000 population, number of hospital beds per 100,000 population, and population density of inhabitable areas
Abbreviations: ACSCs Ambulatory care sensitive conditions, FTEs Full-time equivalents, CI Confidence interval

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