condition mean min max ZT0-3 10.25 10.25 10.25 ZT4-7 15.2 15.2 15.2 ZT8-11 7.199999999999999 7.199999999999999 7.199999999999999 ZT12-15 4.15 4.15 4.15 ZT16-19 10.6 10.6 10.6 ZT20-23 8.6 8.6 8.6