condition mean min max ZT0-3 2.3816699999999997 2.282695 2.480645 ZT4-7 2.6032599999999997 2.6032599999999997 2.6032599999999997 ZT8-11 1.960525 1.960525 1.960525 ZT12-15 0 0 0 ZT16-19 3.2902199999999997 3.2902199999999997 3.2902199999999997 ZT20-23 2.22282 2.22282 2.22282