condition mean min max ZT0-3 2.786038234 2.478416082 3.093660386 ZT4-7 4.349279869 3.3454088855 5.3531508525 ZT8-11 7.217345974500001 6.0514551135 8.3832368355 ZT12-15 7.25813191925 6.776932875 7.7393309635000005 ZT16-19 6.0926301474999995 5.70237257 6.482887725 ZT20-23 9.0445922895 8.685940845000001 9.403243734