condition mean min max ZT0-3 11.826450000000001 11.826450000000001 11.826450000000001 ZT4-7 9.816849999999999 9.816849999999999 9.816849999999999 ZT8-11 8.618245 8.618245 8.618245 ZT12-15 11.328499999999998 11.328499999999998 11.328499999999998 ZT16-19 12.35225 12.35225 12.35225 ZT20-23 13.6198 13.6198 13.6198