condition mean min max ZT0-3 5.0737825 4.601485 5.54608 ZT4-7 2.90082 2.90082 2.90082 ZT8-11 2.7367049999999997 2.7367049999999997 2.7367049999999997 ZT12-15 0 0 0 ZT16-19 4.136055 4.136055 4.136055 ZT20-23 4.712400000000001 4.712400000000001 4.712400000000001