condition mean min max ZT0-3 38.1 38.1 38.1 ZT4-7 20.9 20.9 20.9 ZT8-11 34.449999999999996 34.449999999999996 34.449999999999996 ZT12-15 17.8 17.8 17.8 ZT16-19 27.0 27.0 27.0 ZT20-23 52.9 52.9 52.9