condition mean min max ZT0-3 27.650521 27.650521 27.650521 ZT4-7 12.803121 12.803121 12.803121 ZT8-11 12.2211865 12.2211865 12.2211865 ZT12-15 13.717809 13.717809 13.717809 ZT16-19 16.957079 16.957079 16.957079 ZT20-23 20.1780185 20.1780185 20.1780185