condition mean min max ZT0-3 36.848884 36.848884 36.848884 ZT4-7 33.687234000000004 33.687234000000004 33.687234000000004 ZT8-11 35.213235 35.213235 35.213235 ZT12-15 40.333484999999996 40.333484999999996 40.333484999999996 ZT16-19 28.7227205 28.7227205 28.7227205 ZT20-23 35.1241325 35.1241325 35.1241325