condition mean min max ZT0-3 30.963250000000002 30.963250000000002 30.963250000000002 ZT4-7 28.61435 28.61435 28.61435 ZT8-11 22.97065 22.97065 22.97065 ZT12-15 12.22565 12.22565 12.22565 ZT16-19 25.6437 25.6437 25.6437 ZT20-23 25.787149999999997 25.787149999999997 25.787149999999997