condition mean min max ZT0-3 28.840614620000004 11.14647854 46.534750700000004 ZT4-7 9.756301102 9.483505335 10.029096869 ZT8-11 9.87885098075 8.7414315115 11.01627045 ZT12-15 7.851054541499999 6.897984600999999 8.804124481999999 ZT16-19 6.08813716675 5.7052680785 6.471006255 ZT20-23 7.276616131000001 7.1840865575 7.369145704500001