condition mean min max ZT0-3 6.517482385999999 5.556729445 7.478235326999999 ZT4-7 12.247500009749999 11.406107635 13.0888923845 ZT8-11 8.349200149249999 7.507146252 9.1912540465 ZT12-15 9.341179493750001 7.822431137500001 10.85992785 ZT16-19 8.564852655 7.66000696 9.46969835 ZT20-23 7.15621575875 5.563849493499999 8.748582024000001