Table 2.

Association between physician age and 30 day patient mortality in patients admitted to hospital. Table includes results of three analyses: modeling age as a continuous variable, modeling age as a continuous variable with separate splines at ages <60 and ≥60, and modeling age as categorical variable. All models adjusted for patient and physician characteristics and hospital fixed effects. Standard errors were clustered at physician level. Estimates should be interpreted as average odds ratio across all physician age categories

Physician age	No of admissions (No of physicians*)	Adjusted 30 day mortality rate (95% CI)	Adjusted odds ratio† (95% CI)	P value
Physician age (years) as continuous variable (for every 10 years)
Overall	736 537 (18 854)	—	1.04 (1.03 to 1.06)	<0.001
<60	705 574 (18 180)	—	1.03 (1.02 to 1.05)	<0.001
≥60	30 963 (1086)	—	1.22 (1.08 to 1.37)	0.001
Physician age (years) as categorical variable
<40	309 020 (10 177)	10.8% (10.7% to 10.9%)	Reference	—
40-49	280 894 (8016)	11.1% (11.0% to 11.3%)	1.04 (1.02 to 1.07)	<0.001
50-59	115 660 (3331)	11.3% (11.1% to 11.5%)	1.07 (1.03 to 1.10)	<0.001
≥60	30 963 (1086)	12.1% (11.6% to 12.5%)	1.17 (1.11 to 1.23)	<0.001

*Total number of physicians varies between continuous and categorical analyses because some physicians moved to higher age category during study period.

†Estimates should be interpreted as an average odds ratio across all physician age categories.