condition mean min max ZT0-3 2.8180769999999997 0.274991 4.26338 ZT4-7 1.091064 1.091064 1.091064 ZT8-11 0.8493935 0.8493935 0.8493935 ZT12-15 1.39237975 1.33475 1.4500095 ZT16-19 2.28749 2.28749 2.28749 ZT20-23 4.10214 4.10214 4.10214