condition mean min max ZT0-3 84.969084 84.969084 84.969084 ZT4-7 83.3879685 83.3879685 83.3879685 ZT8-11 40.2972275 40.2972275 40.2972275 ZT12-15 30.302064 30.302064 30.302064 ZT16-19 19.498232 19.498232 19.498232 ZT20-23 24.063419500000002 24.063419500000002 24.063419500000002