condition mean min max ZT0-3 3.6823925 3.1494299999999997 4.215355000000001 ZT4-7 3.9980599999999997 3.9980599999999997 3.9980599999999997 ZT8-11 17.1055 17.1055 17.1055 ZT12-15 0 0 0 ZT16-19 14.65325 14.65325 14.65325 ZT20-23 6.19379 6.19379 6.19379