| GS | = | general surgeon = 1, 0 otherwise |
| IM | = | internist = 1, 0 otherwise, |
| PED | = | pediatrician = 1, 0 otherwise, |
| OBGYN | = | obstetrician-gynecologist = 1, 0 otherwise, |
| SOLO | = | single physician practice = 1, 0 otherwise, |
| LARGE | = | practice with more than 6 full-time physicians = 1, 0 otherwise, |
| URB1 | = | county size 3,500,000 = 1, 0 otherwise, |
| URB2 | = | county size 1,400,000 − 3,499,999 = 1, 0 otherwise, |
| URB3 | = | county size 250,000 − 1,399,999 = 1, 0 otherwise, |
| URB4 | = | county size 50,000 − 249,999 = 1, 0 otherwise, |
| PREPAID | = | physician services prepaid = 1, 0 otherwise, |
| FTEMPLOY | = | number of full-time employee per physician, |
| FULLTIME | = | number of full-time physicians, |
| WORKWKS | = | number of weeks worked by physicians, |
| TIME | = | 1977 = 1, 1976 = 0. |
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