Table 1

Occipitofrontal head circumference (OFC) SD for men and women up to the age of 18 years

AgeOFCOFCSD
Years or monthsMean–1–2–3–4–5–6–7–8–9–10–11–12–13–14–15
Birth34.633.031.429.728.126.524.923.321.620.018.416.815.213.511.910.3
Men
 1 month37.335.834.432.931.430.028.527.025.524.122.621.119.718.216.715.3
 3 months40.338.937.536.034.633.231.830.428.927.526.124.723.321.820.419.0
 6 months43.542.240.839.538.136.835.534.132.831.430.128.827.426.124.723.4
 9 months45.544.242.941.540.238.937.636.334.933.632.331.029.728.327.025.7
 1 year46.945.644.342.941.640.339.037.736.335.033.732.431.129.728.427.1
 1.5 years48.246.945.544.242.841.540.138.837.436.134.733.432.030.729.328.0
 2 years49.247.846.545.143.842.441.039.738.337.035.634.232.931.530.228.8
 2.5 years50.048.647.345.944.643.241.840.539.137.836.435.033.732.331.029.6
 3 years50.549.147.846.445.043.742.340.939.538.236.835.434.132.731.330.0
 3.5 years51.049.648.246.845.444.142.741.339.938.537.135.734.332.931.530.2
 4 years51.249.848.447.045.644.242.841.440.038.637.235.834.433.031.630.2
 4.5 years51.550.148.647.245.744.342.941.440.038.537.135.734.232.831.329.9
 5 years51.850.348.947.446.044.543.041.640.138.737.235.734.332.831.429.9
 5.5 years52.050.549.047.546.044.643.141.640.138.637.135.634.132.631.129.7
 6 years52.250.849.347.946.445.043.542.140.639.237.736.334.833.431.930.5
 7 years52.551.149.748.346.945.644.242.841.440.038.637.235.834.433.031.7
 8 years52.951.550.148.747.346.044.643.241.840.439.037.636.234.833.432.1
 9 years52.250.849.347.946.545.143.642.240.839.337.936.535.033.632.230.8
 10 years53.652.150.649.147.646.144.643.141.640.138.637.135.634.132.631.1
 11 years53.952.450.849.347.746.244.743.141.640.038.537.035.433.932.330.8
 12 years54.152.751.249.848.346.945.444.042.541.139.638.236.735.333.832.4
 13 years54.452.851.349.748.246.645.043.541.940.438.837.235.734.132.631.0
 14 years55.053.451.850.248.647.045.443.842.240.639.037.435.834.232.631.0
 15 years55.553.952.350.849.247.646.044.442.941.339.738.136.535.033.431.8
 16 years56.054.452.851.249.648.146.544.943.341.740.138.536.935.333.732.1
 17 years56.454.853.351.750.248.647.045.543.942.440.839.237.736.134.633.0
 18 years56.755.053.251.449.747.946.144.442.640.839.037.335.533.732.030.2
Women
 1 month37.335.834.432.931.430.028.527.025.524.122.621.119.718.216.715.3
 3 months40.338.937.536.034.633.231.830.428.927.526.124.723.321.820.419.0
 6 months43.542.240.839.538.136.835.534.132.831.430.128.827.426.124.723.4
 9 months45.544.242.941.540.238.937.636.334.933.632.331.029.728.327.025.7
 1 year46.945.644.342.941.640.339.037.736.335.033.732.431.129.728.427.1
 1.5 years48.246.945.544.242.841.540.138.837.436.134.733.432.030.729.328.0
 2 years49.247.846.545.143.842.441.039.738.337.035.634.232.931.530.228.8
 2.5 years50.048.647.345.944.643.241.840.539.137.836.435.033.732.331.029.6
 3 years50.549.147.846.445.043.742.340.939.538.236.835.434.132.731.330.0
 3.5 years51.049.648.246.845.444.142.741.339.938.537.135.734.332.931.530.2
 4 years51.249.848.447.045.644.242.841.440.038.637.235.834.433.031.630.2
 4.5 years51.550.148.647.245.744.342.941.440.038.537.135.734.232.831.329.9
 5 years51.850.348.947.446.044.543.041.640.138.737.235.734.332.831.429.9
 5.5 years52.050.549.047.546.044.643.141.640.138.637.135.634.132.631.129.7
 6 years52.250.849.347.946.445.043.542.140.639.237.736.334.833.431.930.5
 7 years52.551.149.748.346.945.644.242.841.440.038.637.235.834.433.031.7
 8 years52.951.550.148.747.346.044.643.241.840.439.037.636.234.833.432.1
 9 years52.250.849.347.946.545.143.642.240.839.337.936.535.033.632.230.8
 10 years53.652.150.649.147.646.144.643.141.640.138.637.135.634.132.631.1
 11 years53.952.450.849.347.746.244.743.141.640.038.537.035.433.932.330.8
 12 years54.152.751.249.848.346.945.444.042.541.139.638.236.735.333.832.4
 13 years54.452.851.349.748.246.645.043.541.940.438.837.235.734.132.631.0
 14 years55.053.451.850.248.647.045.443.842.240.639.037.435.834.232.631.0
 15 years55.553.952.350.849.247.646.044.442.941.339.738.136.535.033.431.8
 16 years56.054.452.851.249.648.146.544.943.341.740.138.536.935.333.732.1
 17 years56.454.853.351.750.248.647.045.543.942.440.839.237.736.134.633.0
 18 years56.755.053.251.449.747.946.144.442.640.839.037.335.533.732.030.2
  • With thanks to Dr Andrew Jackson, MRC (Medical Research Council) Human Genetics Unit, University of Edinburgh.