condition mean min max ZT0-3 169.55266298 154.12691756 184.9784084 ZT4-7 53.3693972925 48.42214684 58.316647745 ZT8-11 13.69599304975 5.261279933000001 22.130706166499998 ZT12-15 1.3392330129999999 0.9436818754999999 1.7347841505 ZT16-19 5.5915744507500005 2.720658238 8.4624906635 ZT20-23 21.7533230775 17.168445615 26.33820054