condition mean min max ZT0-3 0.42606299999999997 0.42606299999999997 0.42606299999999997 ZT4-7 0.2672865 0.2672865 0.2672865 ZT8-11 0.326993 0.326993 0.326993 ZT12-15 0.2746056 0.2746056 0.2746056 ZT16-19 0.5150440000000001 0.5150440000000001 0.5150440000000001 ZT20-23 0.196986 0.196986 0.196986