condition mean min max ZT0-3 14.92415 11.739650000000001 18.108649999999997 ZT4-7 11.4269 11.4269 11.4269 ZT8-11 8.944875 8.944875 8.944875 ZT12-15 0 0 0 ZT16-19 13.995000000000001 13.995000000000001 13.995000000000001 ZT20-23 10.094584999999999 10.094584999999999 10.094584999999999