condition mean min max ZT0-3 986.664589 986.664589 986.664589 ZT4-7 1677.742826 1677.742826 1677.742826 ZT8-11 2288.0600335 2288.0600335 2288.0600335 ZT12-15 1978.6370619999998 1978.6370619999998 1978.6370619999998 ZT16-19 1837.8881270000002 1837.8881270000002 1837.8881270000002 ZT20-23 1086.8379175 1086.8379175 1086.8379175