condition mean min max ZT0-3 20.0487 17.5039 22.5935 ZT4-7 14.10125 14.10125 14.10125 ZT8-11 8.639115 8.639115 8.639115 ZT12-15 0 0 0 ZT16-19 12.64325 12.64325 12.64325 ZT20-23 18.8928 18.8928 18.8928