condition mean min max ZT0-3 1.4885784439999998 1.269186543 1.707970345 ZT4-7 5.432938700499999 3.5790651385 7.2868122625 ZT8-11 10.48382308 9.23767623 11.72996993 ZT12-15 5.9635615367499994 5.069079336 6.8580437375 ZT16-19 4.32514971 3.641141741 5.009157679 ZT20-23 4.46310154875 4.204810434500001 4.721392663