condition mean min max ZT0-3 1.5614335000000001 1.5614335000000001 1.5614335000000001 ZT4-7 0.723266 0.723266 0.723266 ZT8-11 1.0144959999999998 1.0144959999999998 1.0144959999999998 ZT12-15 0.627405 0.627405 0.627405 ZT16-19 1.086471 1.086471 1.086471 ZT20-23 0.5038055 0.5038055 0.5038055