condition mean min max ZT0-3 16.482152 16.482152 16.482152 ZT4-7 16.581328499999998 16.581328499999998 16.581328499999998 ZT8-11 16.025296 16.025296 16.025296 ZT12-15 16.0849905 16.0849905 16.0849905 ZT16-19 17.354038000000003 17.354038000000003 17.354038000000003 ZT20-23 17.3695075 17.3695075 17.3695075