Fig. 4From: Using the hierarchical ordinal regression model to analyse the intensity of urinary schistosomiasis infection in school children in Lusaka Province, ZambiaSmooth effects of age (middle line) on the intensity of infection (a) for light infection (category 1) shown in plot (a); and (b) moderate/high infection (category 2) shown in panel (b). The outer two lines in both plots represent the corresponding confidence bands at 80% (inner lines from the middle line) and 95% (outer lines)Back to article page