condition mean min max ZT0-3 3.5 3.5 3.5 ZT4-7 13.2 13.2 13.2 ZT8-11 7.55 7.55 7.55 ZT12-15 9.35 9.35 9.35 ZT16-19 13.15 13.15 13.15 ZT20-23 7.949999999999999 7.949999999999999 7.949999999999999