condition mean min max ZT0-3 17.0405 17.0405 17.0405 ZT4-7 8.194135 8.194135 8.194135 ZT8-11 10.876100000000001 10.876100000000001 10.876100000000001 ZT12-15 13.76925 13.76925 13.76925 ZT16-19 22.187350000000002 22.187350000000002 22.187350000000002 ZT20-23 22.2843 22.2843 22.2843