condition mean min max ZT0-3 48.7454005325 43.524071335 53.96672973 ZT4-7 6.64073475725 4.0572290585 9.224240456 ZT8-11 7.900398117250001 4.9624438665 10.838352368 ZT12-15 12.31789341475 12.1698524525 12.465934377 ZT16-19 13.2750635025 11.001698425 15.54842858 ZT20-23 30.07648984 28.208161744999998 31.944817935