Child Development Inventory score categorisation.

<p>The CDI is normed so that a child who performs at the level of a child that is ≥30% younger than their chronological age is classed as having delayed development. This equates to a developmental performance ≥2.0 standard deviations below the mean. Around 2% of children would be expected to be in this category. A child that performs at a level of a child 25 to <30% younger is between 1.5 and <3.0 SD below the mean for developmental performance and is classed as having borderline development. Around a further 3% of children would be expected to be in this category. An odds ratio less than one indicates a beneficial effect of progesterone.</p><p>Child Development Inventory score categorisation.