condition mean min max ZT0-3 13.90155 13.90155 13.90155 ZT4-7 7.243285 7.243285 7.243285 ZT8-11 13.420449999999999 13.420449999999999 13.420449999999999 ZT12-15 14.136800000000001 14.136800000000001 14.136800000000001 ZT16-19 23.7684 23.7684 23.7684 ZT20-23 16.3444 16.3444 16.3444