condition mean min max ZT0-3 9.838212500000001 8.754075 10.92235 ZT4-7 13.260850000000001 13.260850000000001 13.260850000000001 ZT8-11 23.830550000000002 23.830550000000002 23.830550000000002 ZT12-15 0 0 0 ZT16-19 20.7777 20.7777 20.7777 ZT20-23 13.35325 13.35325 13.35325