condition mean min max ZT0-3 39.93855 39.93855 39.93855 ZT4-7 32.3 32.3 32.3 ZT8-11 32.0714 32.0714 32.0714 ZT12-15 39.2288 39.2288 39.2288 ZT16-19 48.061099999999996 48.061099999999996 48.061099999999996 ZT20-23 45.591899999999995 45.591899999999995 45.591899999999995