condition mean min max ZT0-3 13.35615 13.35615 13.35615 ZT4-7 11.909099999999999 11.909099999999999 11.909099999999999 ZT8-11 12.545 12.545 12.545 ZT12-15 15.90705 15.90705 15.90705 ZT16-19 12.8472 12.8472 12.8472 ZT20-23 13.34145 13.34145 13.34145