condition mean min max ZT0-3 1.47531823175 1.2029782065 1.7476582569999999 ZT4-7 1.48449104825 1.198515834 1.7704662625 ZT8-11 4.6156665885 3.49738809 5.733945087 ZT12-15 7.2674585415 6.409514919 8.125402164 ZT16-19 4.521590729250001 4.463994779 4.5791866795 ZT20-23 6.31961511575 5.875918721 6.7633115104999995