condition mean min max ZT0-3 63.20177983 34.42130111 91.98225855 ZT4-7 23.914057182500002 22.133913245000002 25.69420112 ZT8-11 23.583372122500002 23.061904605000002 24.10483964 ZT12-15 22.8100016775 22.532293375000002 23.08770998 ZT16-19 34.051622537499995 27.020698105 41.082546969999996 ZT20-23 64.7927890375 54.390835115 75.19474296