condition mean min max ZT0-3 11.272224999999999 11.007249999999999 11.537199999999999 ZT4-7 7.34121 7.34121 7.34121 ZT8-11 9.0258 9.0258 9.0258 ZT12-15 0 0 0 ZT16-19 12.58155 12.58155 12.58155 ZT20-23 10.674800000000001 10.674800000000001 10.674800000000001