condition mean min max ZT0-3 51.38955 49.42045 53.35865 ZT4-7 36.87195 36.87195 36.87195 ZT8-11 55.649 55.649 55.649 ZT12-15 0 0 0 ZT16-19 55.48285 55.48285 55.48285 ZT20-23 54.0607 54.0607 54.0607