condition mean min max ZT0-3 3.25657 3.25657 3.25657 ZT4-7 0.6006785 0.6006785 0.6006785 ZT8-11 2.5507799999999996 2.5507799999999996 2.5507799999999996 ZT12-15 14.23335 14.23335 14.23335 ZT16-19 21.85115 21.85115 21.85115 ZT20-23 13.5621 13.5621 13.5621