condition mean min max ZT0-3 5.55 5.55 5.55 ZT4-7 13.4 13.4 13.4 ZT8-11 8.5 8.5 8.5 ZT12-15 22.85 22.85 22.85 ZT16-19 16.75 16.75 16.75 ZT20-23 22.150000000000002 22.150000000000002 22.150000000000002