condition mean min max ZT0-3 20.5611 20.5611 20.5611 ZT4-7 18.057850000000002 18.057850000000002 18.057850000000002 ZT8-11 10.19515 10.19515 10.19515 ZT12-15 12.27275 12.27275 12.27275 ZT16-19 18.38035 18.38035 18.38035 ZT20-23 21.53815 21.53815 21.53815