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. Author manuscript; available in PMC: 2013 Feb 6.
Published in final edited form as: Dev Psychol. 2012 Apr 30;49(2):197–214. doi: 10.1037/a0028318

Table 2.

Descriptive statistics (Percentage of sample for ordinal variables and means and standard deviations for continuous variables).

14 months 20 months 24 months 36 months
Concern for Others
 Mother Interview 0 – 35.5% 0 – 7.2% 0 –5.4% 0 – 2.1%
1 – 29.9% 1 – 24.6% 1 – 16.0% 1 – 13.8%
2 – 24.5% 2 – 44.4% 2 – 42.1% 2 – 47.1%
3 – 10.1% 3 – 23.8% 3 – 36.5% 3 – 37.0%
 Observations 0 – 30.4% 0 – 13.8% 0 – 8.4% 0 – 10.3%
1 – 41.1% 1 – 36.3% 1 – 26.3% 1 – 19.8%
2 – 19.8% 2 – 27.0% 2 – 27.6% 2 – 25.8%
3 – 8.7% 3 – 22.9% 3 – 37.7% 3 – 44.1%
Disregard for Others
 Mother Interview 0 – 43.7% 0 – 35.2% 0 – 35.1% 0 – 37.4%
1 – 23.5% 1 – 33.9% 1 – 36.0% 1 – 36.7%
2 – 17.3% 2 – 18.5% 2 – 17.7% 2 – 15.2%
3 – 15.5% 3 – 12.4% 3 – 11.2% 3 – 10.8%
 Observations 0 – 78.5% 0 – 87.9% 0 – 88.5% 0 – 84.4%
1 – 15.5% 1 – 9.7% 1 – 8.8% 1 – 11.9%
2 – 6.1% 2 – 2.4% 2 – 2.7% 2 – 3.6%
Language Skills 19.05 (4.22) 32.48 (5.59) 41.05 (5.36) 10.07 (4.26)
General Cognitive Ability 112.43 (5.50) 136.06 (8.54) 148.78 (8.30) 103.13 (17.70)

Note. A different assessment was administered at age 36 months to assess general cognitive ability, and a different set of items were administered at age 36 months to assess language skills. Therefore, the change in general cognitive ability and language skills between 24 and 36 motnhs is not meaningful.