condition mean min max ZT0-3 58.425632 58.425632 58.425632 ZT4-7 36.315309 36.315309 36.315309 ZT8-11 51.1676275 51.1676275 51.1676275 ZT12-15 56.85834799999999 56.85834799999999 56.85834799999999 ZT16-19 67.918214 67.918214 67.918214 ZT20-23 93.44757150000001 93.44757150000001 93.44757150000001