condition mean min max ZT0-3 13.711649999999999 12.94195 14.481349999999999 ZT4-7 8.564125 8.564125 8.564125 ZT8-11 9.603695 9.603695 9.603695 ZT12-15 0 0 0 ZT16-19 11.67915 11.67915 11.67915 ZT20-23 11.4677 11.4677 11.4677