condition mean min max ZT0-3 11.5416825 10.012965000000001 13.0704 ZT4-7 12.44135 12.44135 12.44135 ZT8-11 5.025785 5.025785 5.025785 ZT12-15 0 0 0 ZT16-19 5.007705 5.007705 5.007705 ZT20-23 6.35738 6.35738 6.35738