condition mean min max ZT0-3 5.40931 5.38768 5.43094 ZT4-7 7.679065 7.679065 7.679065 ZT8-11 8.89667 8.89667 8.89667 ZT12-15 0 0 0 ZT16-19 7.45761 7.45761 7.45761 ZT20-23 8.316125 8.316125 8.316125