condition mean min max ZT0-3 94.456544 94.456544 94.456544 ZT4-7 70.372234 70.372234 70.372234 ZT8-11 101.610656 101.610656 101.610656 ZT12-15 115.289061 115.289061 115.289061 ZT16-19 71.68796 71.68796 71.68796 ZT20-23 45.1393125 45.1393125 45.1393125