condition mean min max ZT0-3 7.1499999999999995 7.1499999999999995 7.1499999999999995 ZT4-7 4.9 4.9 4.9 ZT8-11 10.9 10.9 10.9 ZT12-15 4.55 4.55 4.55 ZT16-19 7.3 7.3 7.3 ZT20-23 5.45 5.45 5.45