condition mean min max ZT0-3 6.56244 6.56244 6.56244 ZT4-7 5.41109 5.41109 5.41109 ZT8-11 5.90775 5.90775 5.90775 ZT12-15 4.5494 4.5494 4.5494 ZT16-19 6.862584999999999 6.862584999999999 6.862584999999999 ZT20-23 5.188775 5.188775 5.188775