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Table 2 Season-adapted cut-offs for vitamin D insufficiency by calendar month

From: Protocol of the VICTORIA study: personalized vitamin D supplementation for reducing or preventing fatigue and enhancing quality of life of patients with colorectal tumor - randomized intervention trial

Calendar month

Median 25(OH)D [nmol/L]

Difference to median of August [nmol/L]

Season-adapted 25(OH)D cut-off [nmol/L]

January

40

15

35

February

40

15

35

March

40

15

35

April

40

15

35

May

41

14

36

June

50

5

45

July

53

2

48

August

55

0

50

September

53

2

48

October

52

3

47

November

45

10

40

December

43

12

38