condition mean min max ZT0-3 7.44266 1.7191 10.8722 ZT4-7 2.24774 2.24774 2.24774 ZT8-11 2.822235 2.822235 2.822235 ZT12-15 7.3181 5.8390450000000005 8.797155 ZT16-19 9.27251 9.27251 9.27251 ZT20-23 13.7527 13.7527 13.7527