How Common Is Mateo's Cleft, and in Whom?
Take the reading one piece at a time. For each piece: read it once, underline the sentence that says what happens, then look up any word in the list. Tap a word to see its definition.
Piece 1 of 2
Real birth-prevalence and pattern data for orofacial clefts (from two reviews and a meta-analysis). How common overall: about 1 in 700 live births worldwide (about 1.5 per 1000), roughly 220,000 new cases a year. Most common type: cleft lip AND palate together (CLP) about 45%, cleft palate only about 40%, cleft lip alone about 15 to 25%; pooled CLP prevalence is 0.45 per 1000 (95% CI 0.38 to 0.52). Sex: about 2 boys for every 1 girl for cleft lip with or without palate. Laterality: unilateral (one side) outnumber bilateral about 4 to 1; of one-sided clefts, about 70% are left-sided.
Piece 2 of 2
Prevalence by ancestry: highest in Asian and Amerindian (Native American) groups, often about 1 in 500 and up to about 4 per 1000; intermediate in European-derived groups, about 1 in 1000; lowest in African-derived groups, about 1 in 2500. Read these as levels (highest, middle, lowest), not as precise constants. The highest group is consistently Asian and Amerindian populations, but a single trustworthy Native American prevalence number is not settled in the literature, so that point is kept qualitative.
Reading the Research
- Skim the title and abstract first to get the gist.
- Circle the one sentence that states the main claim.
- Box the evidence the authors give for that claim.
- Mark one sentence that confuses you, and move on.
Now put it together: In one or two sentences, say what this whole reading is telling you about Mateo. Then go back to the lesson and fill in the guided notes.