condition mean min max ZT0-3 8.59695 8.006184999999999 9.242435 ZT4-7 7.96801 7.96801 7.96801 ZT8-11 7.296894999999999 7.296894999999999 7.296894999999999 ZT12-15 14.666625 14.2981 15.03515 ZT16-19 9.521465 9.521465 9.521465 ZT20-23 12.7745 12.7745 12.7745