condition mean min max ZT0-3 0.6758872355 0.327450128 1.024324343 ZT4-7 1.7086680295 1.4239103165000002 1.9934257425000002 ZT8-11 2.3775065800000004 1.8362100104999999 2.9188031495000004 ZT12-15 7.49917234325 5.95839677 9.0399479165 ZT16-19 6.2700066265 5.980935281 6.559077972 ZT20-23 7.01064164775 6.4357684195000004 7.5855148759999995