condition mean min max ZT0-3 65.17943333333334 31.0104 95.67695 ZT4-7 31.90535 31.90535 31.90535 ZT8-11 24.79365 24.79365 24.79365 ZT12-15 44.92 38.494550000000004 51.34545 ZT16-19 43.421800000000005 43.421800000000005 43.421800000000005 ZT20-23 79.1959 79.1959 79.1959