condition mean min max ZT0-3 7.159825 7.04452 7.27513 ZT4-7 7.662125 7.662125 7.662125 ZT8-11 6.90698 6.90698 6.90698 ZT12-15 0 0 0 ZT16-19 10.6234 10.6234 10.6234 ZT20-23 7.817315000000001 7.817315000000001 7.817315000000001