condition mean min max ZT0-3 11.819685 11.819685 11.819685 ZT4-7 12.967251000000001 12.967251000000001 12.967251000000001 ZT8-11 13.068786 13.068786 13.068786 ZT12-15 13.648225 13.648225 13.648225 ZT16-19 13.648225 13.648225 13.648225 ZT20-23 13.848958 13.848958 13.848958