condition mean min max ZT0-3 12.70461 12.70461 12.70461 ZT4-7 12.955019 12.955019 12.955019 ZT8-11 13.161613 13.161613 13.161613 ZT12-15 12.610903 12.610903 12.610903 ZT16-19 12.098364499999999 12.098364499999999 12.098364499999999 ZT20-23 11.7276145 11.7276145 11.7276145