condition mean min max ZT0-3 7.46158 7.46158 7.46158 ZT4-7 6.037875 6.037875 6.037875 ZT8-11 6.687575000000001 6.687575000000001 6.687575000000001 ZT12-15 7.69869 7.69869 7.69869 ZT16-19 9.79435 9.79435 9.79435 ZT20-23 8.99916 8.99916 8.99916