condition mean min max ZT0-3 3.3060825 2.70158 3.910585 ZT4-7 3.2584999999999997 3.2584999999999997 3.2584999999999997 ZT8-11 5.316265 5.316265 5.316265 ZT12-15 0 0 0 ZT16-19 5.00198 5.00198 5.00198 ZT20-23 4.01424 4.01424 4.01424