condition mean min max ZT0-3 10.851896944 9.675376778 12.02841711 ZT4-7 6.04763007625 5.7897618575 6.305498295 ZT8-11 7.351349011499999 6.2249256084999995 8.477772414499999 ZT12-15 10.869672151 9.7825273105 11.956816991499998 ZT16-19 10.03066215525 9.136243528000001 10.9250807825 ZT20-23 16.163464597500003 14.285191295 18.0417379