condition mean min max ZT0-3 9.47818 8.953165 10.003195 ZT4-7 5.310655 5.310655 5.310655 ZT8-11 3.06593 3.06593 3.06593 ZT12-15 0 0 0 ZT16-19 11.22067 11.22067 11.22067 ZT20-23 12.08835 12.08835 12.08835