Table 1.

Summary statistics for treatment and nontreatment variables

Variable	Mean	SD	Minimum	Maximum
PG6001 Dose, mL	2.75	0.43	1.50	5.00
CIDR2, yes=1	0.57	0.50	0	1
SMB3, yes=1	0.43	0.50	0	1
Min Temp4	11.31	2.84	1.70	23.33
Day of the year	199	30.43	140	265
Device Use Count	1.56	1.05	1	6

¹PG600 (Merck Animal Health, Summit, NJ).

²CIDR = controlled internal drug releasing device (Pfizer Inc., New York, NY).

³SMB = Syncro-Mate-B device (Sanofi Animal Health, Overland Park, KS).

⁴Min Temp = Minimum Daily Temperature, °C.