condition mean min max ZT0-3 103.078214 103.078214 103.078214 ZT4-7 47.4659325 47.4659325 47.4659325 ZT8-11 56.68114 56.68114 56.68114 ZT12-15 63.134634999999996 63.134634999999996 63.134634999999996 ZT16-19 44.2924725 44.2924725 44.2924725 ZT20-23 39.3753565 39.3753565 39.3753565