condition mean min max ZT0-3 20.35 20.35 20.35 ZT4-7 16.3 16.3 16.3 ZT8-11 14.15 14.15 14.15 ZT12-15 31.15 31.15 31.15 ZT16-19 23.75 23.75 23.75 ZT20-23 16.3 16.3 16.3