condition mean min max ZT0-3 41.576807 41.576807 41.576807 ZT4-7 54.9600485 54.9600485 54.9600485 ZT8-11 59.180488 59.180488 59.180488 ZT12-15 50.779461999999995 50.779461999999995 50.779461999999995 ZT16-19 62.127444 62.127444 62.127444 ZT20-23 63.324346000000006 63.324346000000006 63.324346000000006