condition mean min max ZT0-3 8.450000000000001 8.450000000000001 8.450000000000001 ZT4-7 1.3 1.3 1.3 ZT8-11 35.15 35.15 35.15 ZT12-15 17.45 17.45 17.45 ZT16-19 8.55 8.55 8.55 ZT20-23 30.1 30.1 30.1