condition mean min max ZT0-3 6.59379 3.27759 8.369825 ZT4-7 4.64306 4.64306 4.64306 ZT8-11 5.06484 5.06484 5.06484 ZT12-15 5.577665 5.400815 5.754515 ZT16-19 6.725115000000001 6.725115000000001 6.725115000000001 ZT20-23 10.3532 10.3532 10.3532