condition mean min max ZT0-3 7.9096925 7.713305 8.10608 ZT4-7 8.89148 8.89148 8.89148 ZT8-11 11.4557 11.4557 11.4557 ZT12-15 0 0 0 ZT16-19 11.37837 11.37837 11.37837 ZT20-23 9.586715 9.586715 9.586715