condition mean min max ZT0-3 277.4 277.4 277.4 ZT4-7 480.5 480.5 480.5 ZT8-11 556.05 556.05 556.05 ZT12-15 579.3 579.3 579.3 ZT16-19 493.0 493.0 493.0 ZT20-23 367.4 367.4 367.4