condition mean min max ZT0-3 2.7223775000000003 1.5714350000000001 3.87332 ZT4-7 0.8446495 0.8446495 0.8446495 ZT8-11 0.8457764999999999 0.8457764999999999 0.8457764999999999 ZT12-15 0 0 0 ZT16-19 1.513965 1.513965 1.513965 ZT20-23 1.5225499999999998 1.5225499999999998 1.5225499999999998