condition mean min max ZT0-3 5.50244 5.0657700000000006 5.93911 ZT4-7 5.921145 5.921145 5.921145 ZT8-11 5.346335 5.346335 5.346335 ZT12-15 0 0 0 ZT16-19 7.68504 7.68504 7.68504 ZT20-23 7.21862 7.21862 7.21862