Table 7. Logistic univariable analysis for associations between various factors and endoparasitism in Tennessee sheep, 2017–2021.
| Variable | Category | Endoparasitism N (%) |
No Endoparasitism N (%) |
OR | 95% CI | P value |
|---|---|---|---|---|---|---|
| Age | Adult | 75 (30.24) | 173 (69.76) | Ref | — | — |
| Fetus | 6 (4.88) | 117 (95.12) | 0.12 | 0.04–0.34 | <0.0001 | |
| Neonate | 4 (10.81) | 33 (89.19) | 0.28 | 0.08–1.04 | 0.0589 | |
| Juvenile | 97 (66.44) | 49 (33.56) | 4.57 | 2.68–7.79 | <0.0001 | |
| Sex | Male | 64 (34.97) | 119 (65.03) | Ref | — | — |
| Female | 114 (35.08) | 211 (64.92) | 1.01 | 0.65–1.55 | 0.9996 | |
| Unknown | 4 (8.70) | 42 (91.30) | 0.18 | 0.05–0.60 | 0.0032 | |
| Breed | Hampshire | 8 (23.53) | 26 (76.47) | Ref | — | — |
| Katahdin | 57 (39.58) | 86 (60.42) | 2.13 | 0.73–6.24 | 0.2467 | |
| Mixed | 27 (31.76) | 58 (68.24) | 1.51 | 0.48–4.75 | 0.7741 | |
| N/A | 74 (32.89) | 151 (67.11) | 1.59 | 0.56–4.55 | 0.6352 | |
| Other Meat | 14 (23.73) | 45 (76.27) | 1.01 | 0.29–3.51 | 1.000 | |
| Other Dairy/fiber | 2 (28.57) | 5 (71.43) | 1.30 | 0.13–12.68 | 0.9970 | |
| Test laboratory | Kord | 90 (31.47) | 196 (68.53) | Ref | — | — |
| UTCVM | 92 (34.33) | 176 (65.67) | 1.14 | 0.80–1.62 | 0.4743 | |
| Year | 2017 | 51 (39.84) | 77 (60.16) | Ref | — | — |
| 2018 | 46 (42.59) | 62 (57.41) | 1.12 | 0.58–2.16 | 0.9829 | |
| 2019 | 23 (21.10) | 86 (78.90) | 0.40 | 0.20–0.84 | 0.0088 | |
| 2020 | 27 (24.77) | 82 (75.23) | 0.50 | 0.25–1.01 | 0.0531 | |
| 2021 | 35 (35.00) | 65 (65.00) | 0.81 | 0.41–1.61 | 0.8832 | |
| Month | January | 18 (27.69) | 47 (72.31) | Ref | — | — |
| February | 12 (16.44) | 61 (83.56) | 0.51 | 0.16–1.66 | 0.6202 | |
| March | 10 (12.99) | 67 (87.01) | 0.39 | 0.12–1.32 | 0.2388 | |
| April | 7 (18.42) | 31 (81.58) | 0.59 | 0.15–2.39 | 0.9464 | |
| May | 14 (37.84) | 23 (62.16) | 1.59 | 0.47–5.40 | 0.9446 | |
| June | 22 (62.86) | 13 (37.14) | 4.42 | 1.27–15.36 | 0.0094 | |
| July | 38 (66.67) | 19 (33.33) | 5.22 | 1.74–15.71 | 0.0004 | |
| August | 11 (32.35) | 23 67.65) | 1.25 | 0.35–4.50 | 0.9999 | |
| September | 17 (40.48) | 25 (59.52) | 1.78 | 0.55–5.72 | 0.7821 | |
| October | 12 (40.00) | 18 (60.00) | 1.74 | 0.48–6.36 | 0.8885 | |
| November | 12 (38.71) | 19 (61.29) | 1.65 | 0.46–5.98 | 0.9355 | |
| December | 9 (25.71) | 26 (74.29) | 0.90 | 0.24–3.41 | 1.0000 | |
| Season | Spring | 31 (20.39) | 121 (79.61) | Ref | — | — |
| Summer | 71 (56.35) | 55 (43.65) | 5.04 | 2.67–9.50 | <0.0001 | |
| Fall | 41 (39.81) | 62 (60.19) | 2.58 | 1.32–5.04 | 0.0026 | |
| Winter | 39 (22.54) | 134 (77.46) | 1.14 | 0.60–2.15 | 0.9334 | |
| Region (State) | West TN | 19 (35.19) | 35 (64.81) | Ref | — | — |
| East TN | 91 (33.96) | 177 (66.04) | 0.95 | 0.48–1.86 | 0.9677 | |
| Middle TN | 72 (31.03) | 160 (68.97) | 0.83 | 0.42–1.65 | 0.7151 |