condition mean min max ZT0-3 14.961765 14.961765 14.961765 ZT4-7 9.7398265 9.7398265 9.7398265 ZT8-11 11.9586225 11.9586225 11.9586225 ZT12-15 12.823751999999999 12.823751999999999 12.823751999999999 ZT16-19 12.078448 12.078448 12.078448 ZT20-23 11.918329 11.918329 11.918329