condition mean min max ZT0-3 12.9741 12.9741 12.9741 ZT4-7 11.8506 11.8506 11.8506 ZT8-11 10.85075 10.85075 10.85075 ZT12-15 10.7713 10.7713 10.7713 ZT16-19 13.1235 13.1235 13.1235 ZT20-23 13.5688 13.5688 13.5688