condition mean min max ZT0-3 5.55377 4.366875 6.852589999999999 ZT4-7 3.075005 3.075005 3.075005 ZT8-11 0.6040325 0.6040325 0.6040325 ZT12-15 0.856648 0.5338455 1.1794505 ZT16-19 1.815015 1.815015 1.815015 ZT20-23 4.4033999999999995 4.4033999999999995 4.4033999999999995