condition mean min max ZT0-3 36.55455 36.55455 36.55455 ZT4-7 38.7995 38.7995 38.7995 ZT8-11 43.4914 43.4914 43.4914 ZT12-15 34.14295 34.14295 34.14295 ZT16-19 35.6436 35.6436 35.6436 ZT20-23 27.415599999999998 27.415599999999998 27.415599999999998