condition mean min max ZT0-3 8.112514999999998 8.048919999999999 8.17611 ZT4-7 8.06267 8.06267 8.06267 ZT8-11 5.97489 5.97489 5.97489 ZT12-15 0 0 0 ZT16-19 6.31772 6.31772 6.31772 ZT20-23 6.926325 6.926325 6.926325