II. Approach: Step 1 - Calculate Final Height prediction (mid-parental height)
- Boy
- In: (Father's Height + Mother's Height + 5) / 2
- Cm: (Father's Height + Mother's Height + 13) / 2
- Girl
- In: (Father's Height - 5 + Mother's Height) / 2
- Cm: (Father's Height - 13 + Mother's Height) / 2
III. Approach: Step 2 - Identify Predicted Growth Percentile
- Use above predicted mean height to mark growth chart
- Mark chart at 18-20 year old mark
- Mark Confidence Intervals
- Mean Height in inches +/- 2 inches (some use 3.3 or 4 inches)
- Mean Height in centimeters +/- 5 centimeters (some use 8.3 or 10 cm)
- Identify growth percentiles for the predicted height
IV. Approach: Step 3 - Indications for growth evaluation
- By age 2 years, children reach their genetically programmed growth percentile (based on mid-parental height)
- Child over age 24 months should fall into above percentiles
- Growth should at least parallel the 3rd or 97th percentile line
- Pursue growth evaluation for any child below minimum or above maximum