condition mean min max ZT0-3 11.945533333333334 10.5292 13.38495 ZT4-7 5.527105000000001 5.527105000000001 5.527105000000001 ZT8-11 6.561764999999999 6.561764999999999 6.561764999999999 ZT12-15 13.7135 11.98865 15.43835 ZT16-19 12.8407 12.8407 12.8407 ZT20-23 15.0297 15.0297 15.0297