condition mean min max ZT0-3 20.9247 20.9247 20.9247 ZT4-7 11.46335 11.46335 11.46335 ZT8-11 9.712990000000001 9.712990000000001 9.712990000000001 ZT12-15 14.57005 14.57005 14.57005 ZT16-19 23.415750000000003 23.415750000000003 23.415750000000003 ZT20-23 26.492449999999998 26.492449999999998 26.492449999999998