condition mean min max ZT0-3 1.4233675 1.376285 1.47045 ZT4-7 1.2372800000000002 1.2372800000000002 1.2372800000000002 ZT8-11 0.5577645 0.5577645 0.5577645 ZT12-15 0 0 0 ZT16-19 0.47971149999999996 0.47971149999999996 0.47971149999999996 ZT20-23 2.4332700000000003 2.4332700000000003 2.4332700000000003