condition mean min max ZT0-3 53.14835333500001 46.29873320000001 59.997973470000005 ZT4-7 38.1534109575 35.781027015 40.5257949 ZT8-11 34.3001191125 32.900475295 35.69976293 ZT12-15 17.6932818925 14.340924829999999 21.045638955 ZT16-19 17.4266417675 14.560076385 20.29320715 ZT20-23 25.845170855 24.349538765 27.340802945