Table 3.

Proportion of Patients Cared for by Different Types of Surgeons by Surgeon Volume

Surgeon characteristics*	Total surgeons, n	Total patients, n	Surgeon volume
			Very low, %	Low, %	Medium, %	High, %	Very high, %
Total cohort	1,884	6,000	1,290	1,577	1,682	843	608
Gender†
Male	1,728	5,592	92.9	95.7	96.9	96.7	85.0
Female	113	327	7.1	4.3	3.1	3.3	15.0
Age† y
< 40	795	1,155	21.3	21.4	18.5	13.2	22.7
40–49	1,568	2,296	29.6	37.3	39.1	44.5	52.8
50–59	1,185	1,639	26.0	24.1	30.2	36.7	21.2
≥ 60	666	829	23.1	17.3	12.2	5.7	3.3
Practice location†
Urban	1,586	4,768	82.6	79.1	74.2	79.5	89.9
Large rural	192	437	5.7	7.9	9.4	7.2	3.3
Small rural	214	386	5.4	6.4	7.6	8.0	3.6
Isolated rural	242	397	6.4	6.6	8.8	5.3	3.1
Board certification†
General surgery	1,440	3,960	81.0	83.7	73.9	39.5	13.8
Colorectal surgery	185	1,489	4.6	7.2	18.8	57.4	86.2
Board certified, but not in GS, CR	18	27	1.4	0.3	0.4	0.0	0.0
No certification	198	443	13.1	8.9	6.9	3.1	0.0
Years of practice†
0–14	1,108	1,616	27.9	29.7	24.6	23.5	32.7
15–24	1,435	2,060	27.2	32.4	35.5	39.6	45.4
25–34	1,119	1,573	24.9	23.3	30.1	32.9	20.2
≥ 35	552	670	20.0	14.7	8.9	4.0	1.6
Hospital volume†
Very low	768	1,432	45.6	28.2	19.3	7.3	4.7
Low	589	1,607	24.4	32.7	31.4	26.2	7.4
Medium	411	1,391	15.0	20.7	29.3	27.3	26.7
High	238	773	9.4	10.6	10.6	24.0	18.5
Very high	162	732	5.6	7.8	9.4	15.2	42.7
Solo practice†
No	1,074	3,594	56.8	59.7	60.1	60.1	73.9
Yes	767	2,325	43.2	40.3	39.9	39.9	26.2

^*Missing cases for the surgeon volume analysis: gender, age, board certification, years of practice, solo practice = 81 patients, area of practice = 12 patients, hospital volume = 65 patients.

^†Overall chi-square significance at ≤0.001.

CR, colorectal surgery; GS, general surgery.