condition mean min max ZT0-3 0.5600698333333334 0.2520065 0.7688785 ZT4-7 0.5039415 0.5039415 0.5039415 ZT8-11 0.450682 0.450682 0.450682 ZT12-15 0.43271400000000004 0.3988295 0.4665985 ZT16-19 0.465802 0.465802 0.465802 ZT20-23 0.5577544999999999 0.5577544999999999 0.5577544999999999