Table 2 Univariable risk factors associated with CNS ≥3/5

Height (cm, categorical)

≤113

8 (8.33)

2 (6.25)

0.33

0.06 – 1.65

114 – 134

20 (20.83)

12 (37.5)

1.50

0.61 – 3.67

135 – 146

22 (22.92)

8 (25.0)

0.57

0.24 – 1.36

147– 159

22 (22.92)

5 (15.62)

0.29

0.11 – 0.80

≥160

24 (25.0)

5 (15.62)

0.26

0.09 – 0.70

9.91

0.04

Breed (categorical)

Native ponies

34 (35.42)

15 (46.88)

0.79

0.40 – 1.55

Lightweight

25 (26.04)

1 (3.12)

0.04

0.005 – 0.31

Native cobs

12 (12.50)

7 (21.88)

1.40

0.44 – 4.41

Sports horse

13 (13.54)

1 (3.12)

0.08

0.01 – 0.64

Other

12 (12.50)

8 (25.0)

2.0

0.60 – 6.64

–

<0.001*

Seasonal change in feeding regimen

No change

13 (13.98)

8 (25.0)

1.60

0.52 – 4.89

Reduction in quantity only

13 (13.98)

3 (9.38)

0.30

0.08 – 1.09

Change Parts

57 (61.29)

14 (43.75)

0.32

0.17 – 0.60

Complete Change

10 (10.75)

7 (21.88)

2.33

0.60 – 9.02

13.04

0.005

Laminitis

No

82 (89.13)

23 (79.31)

0.38

0.24 – 0.63

Yes

10 (10.87)

6 (20.69)

1.50

0.42 – 5.32

4.22

0.04

Fed hay or other supplementary forage during winter months

No

88 (93.62)

26 (86.67)

0.42

0.27 – 0.66

Yes

6 (6.38)

4 (13.33)

2.00

0.37 – 10.92

3.56

0.06

Height binary

Pony (≤148 cm)

50 (52.08)

22 (68.75)

0.78

0.44 – 1.37

Horse (>148 cm)

46 (47.92)

10 (31.25)

0.28

0.14 – 0.56

5.34

0.02

Herd size

96 (100)

-

-

-

−2.48

0.01**

Total

96 (100)

32 (100)