condition mean min max ZT0-3 12.848781 12.848781 12.848781 ZT4-7 13.934044499999999 13.934044499999999 13.934044499999999 ZT8-11 11.811163 11.811163 11.811163 ZT12-15 12.5417175 12.5417175 12.5417175 ZT16-19 13.9062305 13.9062305 13.9062305 ZT20-23 12.8776845 12.8776845 12.8776845