condition mean min max ZT0-3 7.790797500000001 6.850585000000001 8.731010000000001 ZT4-7 5.979735 5.979735 5.979735 ZT8-11 3.426755 3.426755 3.426755 ZT12-15 0 0 0 ZT16-19 12.19345 12.19345 12.19345 ZT20-23 11.87285 11.87285 11.87285