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. 2017 Apr;7(2):e93–e100. doi: 10.1055/s-0037-1601382

Table 2. Linear correlation of blood loss measurements versus extraction assay (reference standard).

Method Correlation coefficient (95% CI) Standardized coefficient p Value Adjusted R2
Visual EBL 0.700 (0.523–0.819) 0.700 < 0.001 0.479
QBLGrav (adjusted) 0.564 (0.339–0.728) 0.564 < 0.001 0.304
Colorimetric 0.951 (0.915–0.972) 0.951 < 0.001 0.902

Abbreviations: CI, confidence interval; EBL, estimated blood loss; QBLGrav, quantitative blood loss.