condition mean min max ZT0-3 23.15 23.15 23.15 ZT4-7 8.9 8.9 8.9 ZT8-11 5.199999999999999 5.199999999999999 5.199999999999999 ZT12-15 25.45 25.45 25.45 ZT16-19 18.15 18.15 18.15 ZT20-23 32.4 32.4 32.4