condition mean min max ZT0-3 12.944109 12.944109 12.944109 ZT4-7 12.8899595 12.8899595 12.8899595 ZT8-11 11.946942 11.946942 11.946942 ZT12-15 14.190766499999999 14.190766499999999 14.190766499999999 ZT16-19 12.972197999999999 12.972197999999999 12.972197999999999 ZT20-23 13.833698 13.833698 13.833698