condition mean min max ZT0-3 0.400989 0.220252 0.5733395 ZT4-7 0.331143 0.331143 0.331143 ZT8-11 0.4532505 0.4532505 0.4532505 ZT12-15 0.76105875 0.689106 0.8330115 ZT16-19 0.5361615 0.5361615 0.5361615 ZT20-23 1.457375 1.457375 1.457375