condition mean min max ZT0-3 1.7506892500000002 1.1030285 2.39835 ZT4-7 0.645929 0.645929 0.645929 ZT8-11 1.5944414999999998 1.5944414999999998 1.5944414999999998 ZT12-15 0 0 0 ZT16-19 0.9433815000000001 0.9433815000000001 0.9433815000000001 ZT20-23 0.47473050000000006 0.47473050000000006 0.47473050000000006