condition mean min max ZT0-3 24.4 24.4 24.4 ZT4-7 8.9 8.9 8.9 ZT8-11 14.299999999999999 14.299999999999999 14.299999999999999 ZT12-15 18.05 18.05 18.05 ZT16-19 6.199999999999999 6.199999999999999 6.199999999999999 ZT20-23 27.15 27.15 27.15