condition mean min max ZT0-3 5.007235 5.007235 5.007235 ZT4-7 4.70358 4.70358 4.70358 ZT8-11 3.68077 3.68077 3.68077 ZT12-15 4.286425 4.286425 4.286425 ZT16-19 4.961765 4.961765 4.961765 ZT20-23 4.955215000000001 4.955215000000001 4.955215000000001