condition mean min max ZT0-3 6.3836825 5.4642 7.303165 ZT4-7 11.46115 11.46115 11.46115 ZT8-11 10.63615 10.63615 10.63615 ZT12-15 0 0 0 ZT16-19 8.569955 8.569955 8.569955 ZT20-23 10.64715 10.64715 10.64715