condition mean min max ZT0-3 11.3274671665 9.794377403 12.86055693 ZT4-7 6.6348476555 6.311212951 6.95848236 ZT8-11 5.603643061250001 5.5966309975 5.610655125 ZT12-15 6.38153817175 5.5119466915 7.2511296519999995 ZT16-19 11.595914861499999 8.589873743 14.60195598 ZT20-23 37.2471894375 24.818082139999998 49.676296735