condition mean min max ZT0-3 0.5078936589999999 0.483718865 0.5320684529999999 ZT4-7 0.30916317075000005 0.2153621635 0.40296417800000006 ZT8-11 0.199671244 0.173811219 0.225531269 ZT12-15 4.70792158 4.0718476395 5.3439955205 ZT16-19 6.6736112290000005 5.566246024 7.780976434 ZT20-23 5.06580961675 3.97933319 6.1522860435