According to the text, rates of physical growth during middle childhood are:

The Physical Growth During Middle Childhood are:

Changes in Body Size and Proportions, Worldwide Variations in Body Size, Secular Trends in Physical Growth, Skeletal Growth, and Brain Development. These are the Body Growth factors of Physical Growth during Middle Childhood. Physical development in middle childhood is characterized by considerable variations in growth patterns. These variations may be due to gender, ethnic origin, genetics, hormones, nutrition, environment, or disease