Table 4. Head circumference-for-age SD curves for Chinese boys and girls, 0–6 years.
| Age (Month)* | Boys | Girls | ||||||||||||||
| L | M | S | −2 SD | −1 SD | Median | +1 SD | +2 SD | L | M | S | −2 SD | −1 SD | Median | +1 SD | +2 SD | |
| 0 | 1.39 | 34.5 | 0.0338 | 32.1 | 33.3 | 34.5 | 35.7 | 36.8 | 1.31 | 34.0 | 0.0347 | 31.6 | 32.8 | 34.0 | 35.2 | 36.4 |
| 1 | 0.81 | 36.9 | 0.0334 | 34.5 | 35.7 | 36.9 | 38.2 | 39.4 | 0.83 | 36.2 | 0.0334 | 33.8 | 35.0 | 36.2 | 37.4 | 38.6 |
| 2 | 0.31 | 38.9 | 0.0328 | 36.4 | 37.6 | 38.9 | 40.2 | 41.5 | 0.37 | 38.0 | 0.0323 | 35.6 | 36.8 | 38.0 | 39.3 | 40.5 |
| 3 | −0.04 | 40.5 | 0.0322 | 37.9 | 39.2 | 40.5 | 41.8 | 43.2 | −0.03 | 39.5 | 0.0313 | 37.1 | 38.3 | 39.5 | 40.8 | 42.1 |
| 4 | −0.21 | 41.7 | 0.0315 | 39.2 | 40.4 | 41.7 | 43.1 | 44.5 | −0.33 | 40.7 | 0.0306 | 38.3 | 39.5 | 40.7 | 41.9 | 43.3 |
| 5 | −0.25 | 42.7 | 0.0308 | 40.2 | 41.5 | 42.7 | 44.1 | 45.5 | −0.51 | 41.6 | 0.0300 | 39.2 | 40.4 | 41.6 | 42.9 | 44.3 |
| 6 | −0.22 | 43.6 | 0.0303 | 41.0 | 42.3 | 43.6 | 44.9 | 46.3 | −0.62 | 42.4 | 0.0296 | 40.0 | 41.2 | 42.4 | 43.7 | 45.1 |
| 8 | −0.10 | 44.8 | 0.0295 | 42.2 | 43.5 | 44.8 | 46.1 | 47.5 | −0.68 | 43.6 | 0.0291 | 41.2 | 42.4 | 43.6 | 44.9 | 46.3 |
| 10 | 0.02 | 45.7 | 0.0289 | 43.1 | 44.4 | 45.7 | 47.0 | 48.4 | −0.66 | 44.5 | 0.0287 | 42.1 | 43.3 | 44.5 | 45.8 | 47.2 |
| 12 | 0.10 | 46.4 | 0.0284 | 43.8 | 45.1 | 46.4 | 47.7 | 49.1 | −0.62 | 45.1 | 0.0285 | 42.7 | 43.9 | 45.1 | 46.5 | 47.8 |
| 15 | 0.18 | 47.0 | 0.0280 | 44.5 | 45.7 | 47.0 | 48.4 | 49.7 | −0.55 | 45.8 | 0.0281 | 43.4 | 44.6 | 45.8 | 47.2 | 48.5 |
| 18 | 0.24 | 47.6 | 0.0276 | 45.0 | 46.3 | 47.6 | 48.9 | 50.2 | −0.47 | 46.4 | 0.0279 | 43.9 | 45.1 | 46.4 | 47.7 | 49.1 |
| 21 | 0.28 | 48.0 | 0.0273 | 45.5 | 46.7 | 48.0 | 49.4 | 50.7 | −0.40 | 46.9 | 0.0276 | 44.4 | 45.6 | 46.9 | 48.2 | 49.6 |
| 24 | 0.32 | 48.4 | 0.0270 | 45.9 | 47.1 | 48.4 | 49.8 | 51.1 | −0.33 | 47.3 | 0.0273 | 44.8 | 46.0 | 47.3 | 48.6 | 50.0 |
| 30 | 0.37 | 49.1 | 0.0266 | 46.5 | 47.8 | 49.1 | 50.4 | 51.7 | −0.21 | 48.0 | 0.0269 | 45.5 | 46.7 | 48.0 | 49.3 | 50.7 |
| 36 | 0.40 | 49.6 | 0.0262 | 47.0 | 48.3 | 49.6 | 50.9 | 52.2 | −0.09 | 48.5 | 0.0265 | 46.0 | 47.3 | 48.5 | 49.8 | 51.2 |
| 42 | 0.42 | 49.9 | 0.0259 | 47.4 | 48.7 | 49.9 | 51.3 | 52.6 | 0.00 | 49.0 | 0.0262 | 46.5 | 47.7 | 49.0 | 50.3 | 51.6 |
| 48 | 0.44 | 50.3 | 0.0256 | 47.8 | 49.0 | 50.3 | 51.6 | 52.9 | 0.08 | 49.4 | 0.0259 | 46.9 | 48.1 | 49.4 | 50.6 | 52.0 |
| 54 | 0.46 | 50.6 | 0.0254 | 48.1 | 49.4 | 50.6 | 51.9 | 53.2 | 0.16 | 49.7 | 0.0256 | 47.2 | 48.4 | 49.7 | 51.0 | 52.3 |
| 60 | 0.47 | 51.0 | 0.0252 | 48.4 | 49.7 | 51.0 | 52.2 | 53.6 | 0.23 | 50.0 | 0.0254 | 47.5 | 48.7 | 50.0 | 51.3 | 52.6 |
| 66 | 0.48 | 51.3 | 0.0249 | 48.7 | 50.0 | 51.3 | 52.5 | 53.8 | 0.29 | 50.3 | 0.0252 | 47.8 | 49.0 | 50.3 | 51.5 | 52.8 |
| 72 | 0.49 | 51.5 | 0.0248 | 49.0 | 50.2 | 51.5 | 52.8 | 54.1 | 0.35 | 50.5 | 0.0251 | 48.0 | 49.2 | 50.5 | 51.8 | 53.1 |
SD, Standard deviation.
*
Exact ages not age groups.