condition mean min max ZT0-3 85.816101 85.816101 85.816101 ZT4-7 63.66258549999999 63.66258549999999 63.66258549999999 ZT8-11 70.1438005 70.1438005 70.1438005 ZT12-15 79.139458 79.139458 79.139458 ZT16-19 63.2217605 63.2217605 63.2217605 ZT20-23 57.086158999999995 57.086158999999995 57.086158999999995