condition mean min max ZT0-3 8.530933093 6.340589996 10.72127619 ZT4-7 7.4290085425 6.7935451855 8.0644718995 ZT8-11 8.7236626335 7.513298077000001 9.93402719 ZT12-15 10.1783415845 10.1019699765 10.254713192499999 ZT16-19 9.35139116675 7.988758622 10.7140237115 ZT20-23 22.171792222500002 16.865757235 27.47782721