condition mean min max ZT0-3 17.876150000000003 16.94425 18.80805 ZT4-7 11.6674 11.6674 11.6674 ZT8-11 10.475010000000001 10.475010000000001 10.475010000000001 ZT12-15 0 0 0 ZT16-19 15.3213 15.3213 15.3213 ZT20-23 14.50505 14.50505 14.50505