condition mean min max ZT0-3 11.85 11.85 11.85 ZT4-7 2.7 2.7 2.7 ZT8-11 3.8 3.8 3.8 ZT12-15 11.15 11.15 11.15 ZT16-19 24.45 24.45 24.45 ZT20-23 13.649999999999999 13.649999999999999 13.649999999999999