condition mean min max ZT0-3 26.855874999999997 25.2792 28.43255 ZT4-7 24.2074 24.2074 24.2074 ZT8-11 23.067500000000003 23.067500000000003 23.067500000000003 ZT12-15 0 0 0 ZT16-19 33.6447 33.6447 33.6447 ZT20-23 28.145899999999997 28.145899999999997 28.145899999999997