condition mean min max ZT0-3 2.62673749675 2.6223396105 2.631135383 ZT4-7 2.2813057247499997 1.718897063 2.8437143864999994 ZT8-11 4.47154039125 3.900070279 5.0430105035 ZT12-15 6.456474812250001 5.3037512405000005 7.609198384000001 ZT16-19 5.06484502725 4.684574427 5.4451156275 ZT20-23 7.40593323625 7.368524649499999 7.443341823