condition mean min max ZT0-3 11.449939 11.449939 11.449939 ZT4-7 12.7250285 12.7250285 12.7250285 ZT8-11 11.279971499999998 11.279971499999998 11.279971499999998 ZT12-15 12.437214 12.437214 12.437214 ZT16-19 11.8216745 11.8216745 11.8216745 ZT20-23 12.9848155 12.9848155 12.9848155