condition mean min max ZT0-3 13.36599 13.36599 13.36599 ZT4-7 14.7791305 14.7791305 14.7791305 ZT8-11 16.62832 16.62832 16.62832 ZT12-15 12.643301000000001 12.643301000000001 12.643301000000001 ZT16-19 14.387284000000001 14.387284000000001 14.387284000000001 ZT20-23 13.368025 13.368025 13.368025