highly significantP < 0.001
The mean API was almost twofold higher in boys (33.0 ± 4.4) than in young men (18.1 ± 2.8), with this difference being highly significant ( P < 0.001, Table 2 , Fig. 1 ).
The mean API was almost twofold higher in boys (33.0 ± 4.4) than in young men (18.1 ± 2.8), with this difference being highly significant ( P < 0.001, Table 2 , Fig. 1 ).