condition mean min max ZT0-3 3420.378054 3420.378054 3420.378054 ZT4-7 4025.3723609999997 4025.3723609999997 4025.3723609999997 ZT8-11 3854.3323474999997 3854.3323474999997 3854.3323474999997 ZT12-15 3819.861524 3819.861524 3819.861524 ZT16-19 3264.604486 3264.604486 3264.604486 ZT20-23 2339.7541380000002 2339.7541380000002 2339.7541380000002