condition mean min max ZT0-3 0.6190992387500001 0.301714291 0.9364841865 ZT4-7 1.9606530055000002 1.370697058 2.5506089530000002 ZT8-11 3.0360433550000003 2.667026417 3.405060293 ZT12-15 2.93752728225 2.7761555315 3.098899033 ZT16-19 2.5564436725000004 2.172345895 2.9405414500000004 ZT20-23 4.66792425375 3.856209405 5.4796391025