condition mean min max ZT0-3 9.01202845625 8.1130270945 9.911029818 ZT4-7 7.125285756 5.2146142215 9.0359572905 ZT8-11 11.390581933250001 10.9777410465 11.80342282 ZT12-15 17.113681370000002 16.52064193 17.70672081 ZT16-19 26.3202959875 24.547759175 28.0928328 ZT20-23 24.9301002675 22.74626351 27.113937025