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Table 3 Performance parameters of the automatic urinometer and the manual urinometera

From: Performance and user evaluation of a novel capacitance-based automatic urinometer compared with a manual standard urinometer after elective cardiac surgery

  Upper LOA Bias Lower LOA
Urinometer parameters n SD SE CI+ \( \overline{\mathbf{x}} \) CI− CI+ \( \overline{\mathbf{x}} \) CI− CI+ \( \overline{\mathbf{x}} \) CI−
AU All 220 7.7 0.5 +18.9 +17.1 +15.4 +2.9 +1.9 +0.9 −11.6 −13.3 −15.1
  <100 ml 176 6.4 0.5 +15.4 +13.8 +12.2 +2.2 +1.3 +0.3 −9.7 −11.3 −12.9
  ≥100 ml 44 11.4 1.7 +33.5 +27.6 +21.6 +8.0 +4.5 +1.0 −12.6 −18.6 −24.5
MU All 188 8.4 0.6 +23.9 +21.8 +19.8 +6.5 +5.3 +4.1 −9.2 −11.3 −13.4
  <100 ml 124 4.5 0.4 +13.1 +11.6 +10.4 +3.6 +2.8 +2.0 −4.8 −6.2 −7.6
  ≥100 ml 64 11.5 1.4 +38.1 +33.1 +28.2 +13.0 +10.1 +7.2 −8.0 −12.9 −17.9
  1. aAU, Automatic urinometer; CI, Confidence interval; LOA, Limit of agreement; MU, Manual urinometer; n, Number of measurements; SD, Standard deviation; SE, Standard error; \( \overline{\mathrm{x}} \), Mean. For each urinometer, data are shown for all measurements combined, as well as subdivided at a volume of 100 ml. All parameters are in milliliters, except n.