condition mean min max ZT0-3 12.5364 12.5364 12.5364 ZT4-7 9.125675 9.125675 9.125675 ZT8-11 8.773115 8.773115 8.773115 ZT12-15 11.73535 11.73535 11.73535 ZT16-19 13.12905 13.12905 13.12905 ZT20-23 13.1583 13.1583 13.1583