condition mean min max ZT0-3 342.347441 342.347441 342.347441 ZT4-7 581.4197135 581.4197135 581.4197135 ZT8-11 584.4235565 584.4235565 584.4235565 ZT12-15 551.5078175 551.5078175 551.5078175 ZT16-19 363.9475825 363.9475825 363.9475825 ZT20-23 306.094475 306.094475 306.094475