condition mean min max ZT0-3 15.293949999999999 15.0738 15.5141 ZT4-7 12.234300000000001 12.234300000000001 12.234300000000001 ZT8-11 12.950949999999999 12.950949999999999 12.950949999999999 ZT12-15 0 0 0 ZT16-19 14.9617 14.9617 14.9617 ZT20-23 14.23545 14.23545 14.23545