condition mean min max ZT0-3 2.34467 2.34467 2.34467 ZT4-7 1.0189145 1.0189145 1.0189145 ZT8-11 1.44705 1.44705 1.44705 ZT12-15 1.2370299999999999 1.2370299999999999 1.2370299999999999 ZT16-19 2.71816 2.71816 2.71816 ZT20-23 3.08924 3.08924 3.08924