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.