condition mean min max ZT0-3 14.124075 14.124075 14.124075 ZT4-7 14.303926 14.303926 14.303926 ZT8-11 13.685073 13.685073 13.685073 ZT12-15 13.401928000000002 13.401928000000002 13.401928000000002 ZT16-19 14.396609 14.396609 14.396609 ZT20-23 15.756899 15.756899 15.756899