condition mean min max ZT0-3 1.9817749999999998 1.9817749999999998 1.9817749999999998 ZT4-7 0.0 0.0 0.0 ZT8-11 0.545795 0.545795 0.545795 ZT12-15 0.4420965 0.4420965 0.4420965 ZT16-19 0.878155 0.878155 0.878155 ZT20-23 0.87334 0.87334 0.87334