condition mean min max ZT0-3 26.258231 26.258231 26.258231 ZT4-7 24.699613499999998 24.699613499999998 24.699613499999998 ZT8-11 22.2615265 22.2615265 22.2615265 ZT12-15 26.517492 26.517492 26.517492 ZT16-19 29.6426335 29.6426335 29.6426335 ZT20-23 28.359544999999997 28.359544999999997 28.359544999999997