Table 1 Results of 25-hydroxyvitamin D concentrations in wild rabbit serum specimens taken in Finland during 2013–2021

Sex

Female: 29

Male: 20

Unknown: 31

3.8

2.9

3.0–4.6

1.9–3.9

0.16 (U = 121.5 z = − 1.4)

Month of sampling

September: 13

October: 9

November: 33

January: 5

February: 11

March: 9

3.8

3.3

3.0

3.9

2.9

3.5

2.6–5.1

2.1–4.7

2.4–3.7

0.1–7.8

1.9–3.9

2.0–5.2

0.70 (H(5) = 3.00)

Year of sampling

2013: 19

2019:14

2020: 9

2021: 38

3.0

3.1

3.8

3.4

2.4–3.6

0.0–9.3

1.8–5.8

2.9–4.0

0.71 (H(3) = 1.369)

Season of sampling²

Winter: 16

Spring: 9

Autumn: 55

All: 3.1

Females: 3.0

Males: 3.2

All: 3.8

Females: 3.5

Males: 4.6

All: 3.35

Females: 5.06

Males: 2.40

2.1–4.1

1.9–4.1

0.0–7.1

2.4–5.2

1.5–5.4

1.1–8.0

2.8–3.9

3.5–6.6

1.2–3.6

0.63 (H(2) = 0.90)

0.07 (H(2) = 5.178)

0.28 (H(2) = 2.493)

Age group

Young: 3

Adult: 35

Unknown: 42

3.7

3.3

0.0–12.0

2.6–4.0

0.64 (U = 20.0 z = − 0.643)

Vitamin D synthesis season

March-October: 31

November-February: 49

3.7

3.1

3.0–4.4

2.6–3.6

0.20 (U = 410.5. z = − 1.265)