| Yt | = | service units per enrollee |
| TIME | = | time variable (coded 0,1,2,3…N) |
| ENROLL | = | binary variable measuring difference in utilization during enrollment relative to pre-KenPAC (coded 1 if enrollment period; 0 if otherwise) |
| POST | = | binary variable measuring difference in utilization during post-KenPAC relative to pre-KenPAC (coded 1 if post-period; 0 if otherwise) |
| SEASON | = | binary variable measuring difference in utilization during winter (coded 1 if December, January, or February; 0 if otherwise) |