Table 2

Discrepancies between scale and reference haemoglobins in individual cases

Variance from reference (g/dl)Initial readingRepeat reading
1 or less340 (65.8%)489 (94.6%)
1.1–1.475 (14.5%)11 (2.1%)
1.5–1.956 (11.2%)9 (1.7%)
2 (one colour shade)44 (8.5%)8 (1.6%)
3 (two colour shades)15 (2.9%)0 (0%)