condition mean min max ZT0-3 2.7084125 2.69864 2.718185 ZT4-7 2.8777 2.8777 2.8777 ZT8-11 1.2691569999999999 1.2691569999999999 1.2691569999999999 ZT12-15 0 0 0 ZT16-19 2.675705 2.675705 2.675705 ZT20-23 3.3204599999999997 3.3204599999999997 3.3204599999999997