condition mean min max ZT0-3 37.4343 37.4343 37.4343 ZT4-7 28.7156 28.7156 28.7156 ZT8-11 25.33775 25.33775 25.33775 ZT12-15 27.07405 27.07405 27.07405 ZT16-19 27.6834 27.6834 27.6834 ZT20-23 31.99855 31.99855 31.99855