condition mean min max ZT0-3 1679.467496 1679.467496 1679.467496 ZT4-7 1992.33009 1992.33009 1992.33009 ZT8-11 2082.072033 2082.072033 2082.072033 ZT12-15 1923.324134 1923.324134 1923.324134 ZT16-19 2009.010261 2009.010261 2009.010261 ZT20-23 2315.477258 2315.477258 2315.477258