condition mean min max ZT0-3 36.285466666666665 27.63995 42.39745 ZT4-7 27.8033 27.8033 27.8033 ZT8-11 30.5347 30.5347 30.5347 ZT12-15 37.35725 35.24255 39.47195 ZT16-19 38.02335 38.02335 38.02335 ZT20-23 45.347849999999994 45.347849999999994 45.347849999999994