condition mean min max ZT0-3 4.54049 4.54049 4.54049 ZT4-7 3.673975 3.673975 3.673975 ZT8-11 5.002195 5.002195 5.002195 ZT12-15 3.802205 3.802205 3.802205 ZT16-19 6.30621 6.30621 6.30621 ZT20-23 5.8930050000000005 5.8930050000000005 5.8930050000000005