condition mean min max ZT0-3 37.78345851 35.23379568 40.33312134 ZT4-7 42.6661820775 33.491772265 51.84059189 ZT8-11 82.6351436025 65.60685256 99.663434645 ZT12-15 53.568359592499995 30.929508455 76.20721072999999 ZT16-19 17.928962087499997 15.548643864999999 20.30928031 ZT20-23 11.8595789075 11.365037035 12.354120779999999