Table 1.

Characteristics of cases and controls.

	n	Cases	n	Controls	P value
Sex (M/F)	665	16.2/83.8%	665	16.2/83.8%
Age at sampling, years	665	25 (21–29)	665	25 (21–29)
Age at disease onset, years	665	33 (28–40)	n.a.
Time from sampling until disease onset, years	665	8 (4–13)	n.a.
Biobank – latitude
Umeå – 63°N	102	15.3%	102	15.3%
Vitamin D3		47 (37–61)		53 (39–68)	0.07
Samples collected between, years		1976–2007		1976–2007
PHAS – n.a.	137	20.6%	137	20.6%
Vitamin D3		59 (43–75)		56 (39–77)	0.64
Samples collected between, years		1972–2001		1972–2001
Örebro – 59°N	29	4.3%	29	4.3%
Vitamin D3		52 (41–63)		50 (36–70)	0.96
Samples collected between, years		1994–2008		1994–2008
Göteborg – 57°N	47	7.1%	47	7.1%
Vitamin D3		56 (41–65)		55 (44–67)	0.97
Samples collected between, years		1995–2009		1995–2009
Skåne – 55°N	311	46.8%	311	46.8%
Vitamin D3		52 (41–68)		52 (40–70)	0.93
Samples collected between, years		1977–2007		1977–2007
Linköping – 58°N	39	5.9%	39	5.9%
Vitamin D3		43 (30–57)		51 (32–61)	0.33
Samples collected between, years		1993–2009		1993–2009
All subjects	665		665
Vitamin D3		53 (40–67)		53 (39–70)	0.50
Age group <20 years	142		142
Vitamin D3		49 (38–64)		51 (39–67)	0.47
Age group 20–29 years	374		374
Vitamin D3		53 (41–67)		53 (39–71)	0.73
Age group 30–39 years	149		149
Vitamin D3		55 (41–72)		56 (42–73)	0.83

PHAS: Public Health Agency of Sweden.

Median (25th–75th percentiles) for continuous variables and percentages for proportions.

Vitamin D concentrations expressed as nmol/L.