condition mean min max ZT0-3 1.0321313333333333 0.366124 1.389465 ZT4-7 0.45906526 0.45906526 0.45906526 ZT8-11 1.3336549999999998 1.3336549999999998 1.3336549999999998 ZT12-15 1.1257058249999998 0.84744665 1.403965 ZT16-19 1.702133 1.702133 1.702133 ZT20-23 0.556795 0.556795 0.556795