condition mean min max ZT0-3 49.825654 49.825654 49.825654 ZT4-7 135.250849 135.250849 135.250849 ZT8-11 157.3190395 157.3190395 157.3190395 ZT12-15 122.805659 122.805659 122.805659 ZT16-19 68.39503400000001 68.39503400000001 68.39503400000001 ZT20-23 59.574647 59.574647 59.574647