condition mean min max ZT0-3 0.4217165 0.343561 0.537109 ZT4-7 0.374365 0.374365 0.374365 ZT8-11 0.054633 0.054633 0.054633 ZT12-15 0.22852525 0.120772 0.33627850000000004 ZT16-19 0.31468549999999995 0.31468549999999995 0.31468549999999995 ZT20-23 0.46753100000000003 0.46753100000000003 0.46753100000000003