condition mean min max ZT0-3 44.888675 41.2647 48.51265 ZT4-7 28.81325 28.81325 28.81325 ZT8-11 40.2057 40.2057 40.2057 ZT12-15 0 0 0 ZT16-19 48.2548 48.2548 48.2548 ZT20-23 38.333349999999996 38.333349999999996 38.333349999999996