Child Adult-Height Predictor — Mid-Parental + Khamis-Roche + CDC Growth Percentile

Real-world use cases

• Decide whether to see a pediatric endocrinologist

  Your 9-year-old son measures at the 5th percentile and your paediatrician mentions "constitutional growth delay" without ordering a bone-age X-ray. Run the tool with his height, weight, and both parents' heights. If the Khamis-Roche prediction lands within ±5 cm of mid-parental, the trajectory is likely familial and benign. If it lands more than 8.5 cm below mid-parental, the tool flags it — that's the clinical threshold where most pediatric endocrinology guidelines recommend a bone-age film and an IGF-1 panel. You walk into the specialist appointment with the numbers already in hand instead of a vague worry.

• Reset family expectations around a teen growth spurt

  A 13-year-old girl whose mom is 158 cm and dad is 170 cm is asking "will I be tall?". Mid-parental alone says ~157 cm, which can be discouraging. Run all three methods: Khamis-Roche uses her current 158 cm (already at adult mid-parental!) plus her weight to factor in pre-pubertal trajectory and typically adds 3-6 cm of expected post-puberty growth. The combined prediction with the confidence band gives a realistic range (e.g., 161-167 cm) so the conversation moves from "am I going to be short" to "here's what's still in front of you, here's how sleep and protein move the needle in the next 18 months".

• Plan post-puberty career or sports decisions early

  A 14-year-old boy who loves basketball wants to know whether to commit to a club academy. His current height puts him in the 60th percentile, parents are 175 cm and 160 cm. The tool predicts an adult range of about 174-180 cm with the Khamis- Roche central estimate — useful but not exceptional for basketball. Combined with the chart showing where his trajectory sits versus the 75th and 90th percentile lines, the family can make an honest call about whether to invest in basketball- first scheduling or keep options diversified.

• Spot when a child has stopped tracking their percentile

  A 7-year-old who tracked at the 50th percentile at age 5 is now reading at the 30th. Plug in the current measurements and parental heights — if Khamis-Roche's prediction has dropped materially since the last time you used the tool (the SVG chart shows the dot drifting down across percentile lines), that's a signal to check thyroid, ferritin, vitamin D, and sleep duration before the next paediatric visit. The growth- curve chart is the single most diagnostic thing you can show a doctor at age 6-10.

Common pitfalls

• Relying only on the mid-parental formula. Its ±5 cm typical error is twice Khamis-Roche's; using it alone is the

• Predicting an adult-height target during the pubertal growth spurt and treating it as final. Around peak height velocity (girls 11-13, boys 13-15) any non-radiographic method can be off by 5-8 cm in either direction — re-run quarterly during puberty.

• Comparing the predicted number to your own adult height instead of your spouse's parents' generation. Adult height has risen ~1 cm per decade in East Asia over the last 40 years; if your child's predicted height beats your own only slightly, that's still on-track.

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