condition mean min max ZT0-3 16.748533 16.748533 16.748533 ZT4-7 15.881712 15.881712 15.881712 ZT8-11 14.461873 14.461873 14.461873 ZT12-15 16.44071 16.44071 16.44071 ZT16-19 11.7803795 11.7803795 11.7803795 ZT20-23 12.560662 12.560662 12.560662