condition mean min max ZT0-3 0.4449745 0.2801865 0.6018330000000001 ZT4-7 0.44304449999999995 0.44304449999999995 0.44304449999999995 ZT8-11 0.5317335 0.5317335 0.5317335 ZT12-15 0.8732232500000001 0.621136 1.1253105 ZT16-19 0.677943 0.677943 0.677943 ZT20-23 0.483842 0.483842 0.483842