condition mean min max ZT0-3 11.3494 11.3494 11.3494 ZT4-7 8.52852 8.52852 8.52852 ZT8-11 10.441195 10.441195 10.441195 ZT12-15 10.349045 10.349045 10.349045 ZT16-19 14.240950000000002 14.240950000000002 14.240950000000002 ZT20-23 10.681 10.681 10.681