. Author manuscript; available in PMC: 2012 Feb 1.

Published in final edited form as: Eur Respir J. 2010 Jul 1;37(2):238–243. doi: 10.1183/09031936.00146509

Table 2.

Comparison of lung function decline and vitamin D status between rapid decliners and slow decliners, matched on date of blood draw (to within 60 days) and clinical center. Data are presented as mean ± standard deviation. p-values calculated using paired t-testing. 25(OH)D = 25-hydroxyvitamin D, FEV₁ = forced expiratory volume in one second, LT = Long-term follow-up visit, Y5 = Year-5 visit.

	Rapid Decliners (n=98)	Slow Decliners (n=98)	p-value
Rate of FEV₁ decline from Y5 to LT (mL/year)	−151.6 ± 47.7	−0.28 ± 24.0	<0.0001
Rate of FEV₁ decline from Y5 to LT (%predicted/year)	−4.3 ± 1.2	+0.7 ± 0.7	<0.0001
Y5 25(OH)D levels (ng/mL)	25.0 ± 10.4	25.9 ± 10.2	0.54