condition mean min max ZT0-3 4.7517542957500005 4.1164426715 5.38706592 ZT4-7 4.440468069 4.150380627500001 4.7305555104999994 ZT8-11 5.72514693625 3.9531012545 7.497192618 ZT12-15 6.01259224 5.957629320000001 6.0675551599999995 ZT16-19 3.4191959212499996 3.1181814779999995 3.7202103644999998 ZT20-23 4.1063759845 3.8259245804999997 4.3868273884999995