condition mean min max ZT0-3 24.2124 24.2124 24.2124 ZT4-7 20.70665 20.70665 20.70665 ZT8-11 20.49705 20.49705 20.49705 ZT12-15 22.05255 22.05255 22.05255 ZT16-19 21.8885 21.8885 21.8885 ZT20-23 33.68 33.68 33.68