condition mean min max ZT0-3 8.1452875 7.8302700000000005 8.460305 ZT4-7 9.1129 9.1129 9.1129 ZT8-11 10.281849999999999 10.281849999999999 10.281849999999999 ZT12-15 0 0 0 ZT16-19 11.04265 11.04265 11.04265 ZT20-23 9.884235 9.884235 9.884235