condition mean min max ZT0-3 7.8999999999999995 7.8999999999999995 7.8999999999999995 ZT4-7 16.7 16.7 16.7 ZT8-11 21.1 21.1 21.1 ZT12-15 5.55 5.55 5.55 ZT16-19 16.15 16.15 16.15 ZT20-23 10.55 10.55 10.55