condition mean min max ZT0-3 7.1117375 6.533195 7.6902800000000004 ZT4-7 5.72996 5.72996 5.72996 ZT8-11 5.20035 5.20035 5.20035 ZT12-15 0 0 0 ZT16-19 11.48275 11.48275 11.48275 ZT20-23 11.58485 11.58485 11.58485