condition mean min max ZT0-3 11.86941 10.669945 14.0439 ZT4-7 8.030525 8.030525 8.030525 ZT8-11 6.855675 6.855675 6.855675 ZT12-15 10.31153 8.552859999999999 12.0702 ZT16-19 9.237645 9.237645 9.237645 ZT20-23 16.80975 16.80975 16.80975