IGFBP1 and cystic fibrosis: When correlations were run separately for one type of sport, only in the group of open-skill sports significant relationships were found for processing speed and IGFBP-1 (r(124) = −.295, p < .001), creatinine (r(202) = −.370, p < .001), urea (r(203) = −.173, p = .014), and vitamin D (r(203) = −.146, p = .037), between selective attention and ft3 (r(226) = −.188, p = .004), creatine kinase (r(205) = −.177, p = .011), creatinine (r(203) = −.286, p < .001), urea (r(205) = −.246, p < .001) and ferritin (r(205) = −.145, p = .038) as well as between CF and vitamin D (r(197) = −.178, p = .012).