condition mean min max ZT0-3 11.569798 11.569798 11.569798 ZT4-7 15.332809 15.332809 15.332809 ZT8-11 13.4479425 13.4479425 13.4479425 ZT12-15 13.065676 13.065676 13.065676 ZT16-19 16.683989 16.683989 16.683989 ZT20-23 11.333523 11.333523 11.333523