Table 1

Statistical analysis of Study 1 scores of wellbeing (Winter 2001–2002).

Intent-to-treat analysis

Per-protocol analysis



Dose of Vitamin D

N

Age

N

mcg/day (IU/day)

Total in group, (% female)

December 2001

Score out of 6;

mean (SD)

February 2002

Score out of 6;

mean (SD)

Total in group,

(% female)

December 2001

Score out of 6;

mean (SD)

February 2002

Score out of 6;

mean (SD)


15 (600)

32 (80%)

53 (14)

2.2 (2.0)

2.3 (2.3)

16 (80%)

2.4 (2.2)

2.3 (2.4)

100 (4000)

32 (83%)

55 (9)

2.0 (2.3)

1.1 (1.8) a

21 (83%)

1.5 (2.2)

1.0 (1.5) bc


a February scores for 100 mcg (4000 IU)/day were lower (better) than in the 15 mcg (600 IU)/day group by two-tail t-score p = 0.072; Mann-Whitney p = 0.072; these 2-tail values are equivalent to 1-tail significance.

b Paired t-test, December score vs February Score p = 0.097; or non-parametric Sign test, p = 0.109.

c Difference between dose groups by t-test p = 0.047; by Mann-Whitney test p = 0.072 (this 2-tail value is equivalent to 1-tail significance)

Vieth et al. Nutrition Journal 2004 3:8   doi:10.1186/1475-2891-3-8

Open Data