condition mean min max ZT0-3 3.328015 3.127255 3.5287750000000004 ZT4-7 2.9204 2.9204 2.9204 ZT8-11 3.2443 3.2443 3.2443 ZT12-15 0 0 0 ZT16-19 4.0728349999999995 4.0728349999999995 4.0728349999999995 ZT20-23 4.941205 4.941205 4.941205