condition mean min max ZT0-3 5.2475036085 4.404045014 6.090962202999999 ZT4-7 3.1995300012500003 2.856412349 3.5426476535 ZT8-11 4.52928621825 4.2729779510000006 4.7855944855 ZT12-15 11.890382309 9.699988388 14.08077623 ZT16-19 11.157756573499999 8.997898642 13.317614505 ZT20-23 7.412464262249999 7.3891386735 7.435789850999999