Table 3

Linear regression examining the effects of age, body mass index (BMI) z-score and SpO2 on blood glucose area under the curve at 120 min (R2=0.34) in 24 subjects with cystic fibrosis

 Predictor Unstandardised β coefficient SE p Value Zero-order correlation Partial correlation Tolerance Constant 171162.9 63729.9 0.014 Age −7.2 145.2 0.961 0.285 −0.011 0.709 BMI z-score −1143.7 666.5 0.102 −0.261 −0.358 0.975 Mean SpO2 −1585.1 647.8 0.024 −0.492 −0.480 0.704
• Zero-order correlation is a measure of linear association between two variables.

• Partial correlation is the correlation that remains between two variables after removing the correlation that is due to their mutual association with other variables.

• Tolerance indicates the percentage variance in a predictor that could not be accounted for by the other predictors.