condition mean min max ZT0-3 38.57628333333333 33.12435 44.16285 ZT4-7 37.615399999999994 37.615399999999994 37.615399999999994 ZT8-11 25.60605 25.60605 25.60605 ZT12-15 25.969524999999997 25.14075 26.798299999999998 ZT16-19 20.05805 20.05805 20.05805 ZT20-23 24.823050000000002 24.823050000000002 24.823050000000002