condition mean min max ZT0-3 49.2 49.2 49.2 ZT4-7 37.0 37.0 37.0 ZT8-11 41.7 41.7 41.7 ZT12-15 38.2 38.2 38.2 ZT16-19 44.449999999999996 44.449999999999996 44.449999999999996 ZT20-23 55.65 55.65 55.65