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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