condition mean min max ZT0-3 43.4 43.4 43.4 ZT4-7 29.8 29.8 29.8 ZT8-11 22.85 22.85 22.85 ZT12-15 22.85 22.85 22.85 ZT16-19 19.150000000000002 19.150000000000002 19.150000000000002 ZT20-23 51.35 51.35 51.35