condition mean min max ZT0-3 11.46114 11.05232 12.03255 ZT4-7 8.06226 8.06226 8.06226 ZT8-11 8.933055 8.933055 8.933055 ZT12-15 16.311300000000003 15.82825 16.79435 ZT16-19 10.970500000000001 10.970500000000001 10.970500000000001 ZT20-23 12.47105 12.47105 12.47105