condition mean min max ZT0-3 92.5 92.5 92.5 ZT4-7 277.4 277.4 277.4 ZT8-11 353.55 353.55 353.55 ZT12-15 641.75 641.75 641.75 ZT16-19 391.6 391.6 391.6 ZT20-23 221.0 221.0 221.0