Table 11. Predictive model describing primary variables associated with mean leptin concentration.

Parameter	Estimate	Standard Error	Pr > |Z|
Intercept	2.280	0.704	0.001
Age	0.024	0.015	0.117
Sex: Male	-	-	-
Sex: Female	-0.531	0.624	0.395
Social Group Contact	-0.047	0.018	0.007	*
Space Experience Per Elephant (500 ft2)	-0.013	0.006	0.034	*
Feed Diversity	1.537	0.471	0.001	*
Walk Week 1: Less than 1 hour per week	-	-	-
Walk Week 2: Between 1–3 hours per week	0.669	0.418	0.109
Walk Week 3: Between 4–6 hours per week	-	-	-
Walk Week 4: Between 5–7 hours per week	-0.477	0.694	0.491
Walk Week 5: Between 7–10 hours per week	-0.769	0.309	0.013	*
Walk Week 6: Between 10–14 hours per week	1.542	1.075	0.152
Walk Week 7: 14 or more hours per week	-0.480	0.258	0.037	*

*P < 0.05