condition mean min max ZT0-3 2.5501825 2.3896300000000004 2.710735 ZT4-7 2.9055850000000003 2.9055850000000003 2.9055850000000003 ZT8-11 4.166845 4.166845 4.166845 ZT12-15 0 0 0 ZT16-19 4.640465 4.640465 4.640465 ZT20-23 4.4793 4.4793 4.4793