Height for boys at 8 years

At 8 years, the median height for boys on the CDC 2000 growth charts is 127.9 cm (50.3 in): half of boys this age measure less and half more. The middle half of boys, from the 25th to the 75th percentile, falls between 124.0 and 131.8 cm, a spread of 7.8 cm. The outer lines of the chart, the 3rd and 97th percentiles, sit at 117.3 and 139.0 cm.

Since 7 years, the median has risen by 6.1 cm over 1 year. By 9 years it reaches 133.5 cm.

For girls at 8 years the median is 127.6 cm, 0.3 cm less than for boys, which is why the charts are drawn separately by sex.

From 2 years CDC recommends its own 2000 growth charts, which draw the 3rd to the 97th percentile; under 2, the WHO charts draw the 2nd to the 98th.

Reading the table: a boy at 8 years who measures 130.0 cm is at about the 64th percentile, meaning that out of 100 boys this age, about 64 measure less. From 2 years this is height measured standing. If a child of 2 or older was measured lying down, CDC subtracts 0.8 cm before comparing.