condition mean min max ZT0-3 5.7148666666666665 4.843624999999999 6.84812 ZT4-7 0.6159375 0.6159375 0.6159375 ZT8-11 2.632715 2.632715 2.632715 ZT12-15 3.196915 3.1031500000000003 3.29068 ZT16-19 2.916455 2.916455 2.916455 ZT20-23 3.8399900000000002 3.8399900000000002 3.8399900000000002