condition mean min max ZT0-3 547.579963 547.579963 547.579963 ZT4-7 3250.8328174999997 3250.8328174999997 3250.8328174999997 ZT8-11 2481.847603 2481.847603 2481.847603 ZT12-15 4328.166312 4328.166312 4328.166312 ZT16-19 3621.453335 3621.453335 3621.453335 ZT20-23 7390.732251 7390.732251 7390.732251