condition mean min max ZT0-3 6.92512 6.92512 6.92512 ZT4-7 5.873905000000001 5.873905000000001 5.873905000000001 ZT8-11 5.4174 5.4174 5.4174 ZT12-15 6.206085 6.206085 6.206085 ZT16-19 7.0731850000000005 7.0731850000000005 7.0731850000000005 ZT20-23 6.405415 6.405415 6.405415