condition mean min max ZT0-3 114.050367 114.050367 114.050367 ZT4-7 128.1845075 128.1845075 128.1845075 ZT8-11 150.701433 150.701433 150.701433 ZT12-15 126.37237100000002 126.37237100000002 126.37237100000002 ZT16-19 106.50648050000001 106.50648050000001 106.50648050000001 ZT20-23 61.805822 61.805822 61.805822