condition mean min max ZT0-3 0.9934233333333333 0.52401 1.47271 ZT4-7 0.0 0.0 0.0 ZT8-11 2.53294 2.53294 2.53294 ZT12-15 4.23286 2.57105 5.89467 ZT16-19 3.33844 3.33844 3.33844 ZT20-23 2.16925 2.16925 2.16925