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. 2016 Jul 14;11(7):e0155146. doi: 10.1371/journal.pone.0155146

Table 5. Independent variables tested as risk factors for BCS = 4 or 5 and statistics associated with the univariate logistic regression.

OR: Odds Ratio.

Hypothesis Variable Reference N Beta OR P value
Demographics
+  Age 230 0.040 1.041 <0.001*
0  Sex ref = Male 46
Female 184 1.044 2.841 <0.001*
0  Species ref = African 131
Asian 99 0.579 1.784 0.077^
0  Origin ref = Wild 168
Captive 58 -1.035 0.352 <0.001*
Exercise
-  Exercise Week ref = 1 47
2 85 -0.598 0.549 0.193
4 20 -0.061 0.940 0.933
5 33 -0.566 0.567 0.187
6 5 -1.080 0.339 0.089^
7 15 -1.467 0.230 0.009*
-  Walk Week ref = 1 94
2 71 -0.242 0.784 0.562
4 13 -0.540 0.582 0.357
5 12 0.078 1.081 0.902
6 7 -0.869 0.419 0.148^
7 8 -1.486 0.226 0.017*
Feeding
-  Feed Day 215 -0.052 0.948 0.290
-  Feed Night 215 -0.119 0.887 0.283
-  Feed Total 215 -0.047 0.953 0.223
-  Feeding Predictability ref = 1 166
2 49 -0.573 0.563 0.125^
-  Feeding Diversity 215 1.262 3.533 0.038*
-  Spread 215 0.391 1.478 0.647
+  Alternative Feeding Methods 222 -0.496 0.608 0.465
Housing
+  Percent Time Indoor 228 -0.010 0.989 0.193
-  Percent Time In/Out Choice 228 0.002 1.002 0.739
-  Space Experience per Elephant 228 0.023 1.023 0.002*
-  Space Experience 228 0.005 1.005 0.009*
Social
-  Animal Contact 228 0.037 1.037 0.396
-  Social Group Contact 228 0.031 1.031 0.021*
Training and Enrichment
+  Rewarding Stimuli Techniques Score Ref = 5 11
6 33 1.323 3.755 0.169
7 89 1.710 5.531 0.077^
8 78 1.556 4.743 0.112^
9 2 -21.990 <0.001 <0.001*
-  Enrichment Diversity 213 -0.216 0.805 0.826

^P value <0.15 utilized as threshold significant level for model building

*P value <0.05. BCSs 1 and 2 are excluded from analysis.

Hypothesis: + Increase odds of having BCS 4 or 5;—Decrease odds of having BCS 4 or 5; 0 Neutral relationship