Table 3

 Sensitivity, specificity, and predictive values for the C/C-13910 genotype defining low lactase activity in a series of 329 children. Lactase activity below 10 U/g protein was used as a cut off point for low enzyme activity

Age group
⩽5 years (n = 109)6–11 years (n = 142)⩾12 years (n = 78)
Predictive value positive10.0%64.8%100.0%
Predictive value negative98.6%97.7%98.4%