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. 2013 Mar 28;346:f1596. doi: 10.1136/bmj.f1596

Table 2.

 Sample descriptive statistics at physician year and physician levels. Values are numbers (percentages)

Statistic Physician years (n=54 736) Physicians (n=5175)
State:
 Florida 19 999 (36.5) 1945 (37.6)
 New York 34 737 (63.5) 3230 (62.4)
Sex:
 Male 34 817 (63.6) 2973 (57.5)
 Female 19 919 (36.4) 2202 (42.6)
Specialty:
 Obstetrics-gynecology 51 772 (94.6) 4898 (94.7)
 Maternal-fetal medicine 2964 (5.4) 277 (5.4)
Medical school location:
 United States or Canada 39 177 (71.6) 3784 (73.1)
 Other 15 559 (28.4) 1391 (26.9)
Practice duration:
 No deliveries in academic year 2009 17 382 (31.8) 2131 (41.2)
 ≥1 delivery in academic year 2009 37 354 (68.2) 3044 (58.8)
Time since obstetrics-gynecology residency completion:
 1-10 years 23 033 (42.1)
 11-20 years 19 350 (35.4)
 21-30 years 10 732 (19.6)
 31-40 years 1621 (3.0)
Obstetrics-gynecology residency completion year:
 1970-79 840 (16.2)
 1980-89 1402 (27.1)
 1990-99 1751 (33.8)
 2000-08 1182 (22.8)
Duration in sample:
 2-5 years 1273 (24.6)
 6-10 years 1314 (25.4)
 11-15 years 1193 (23.1)
 16-18 years 1395 (27.0)

Column percentages may not sum to 100 owing to rounding.