For data analysis, fine motor performance was divided into five categories according to the BSITD-III manual, as mentioned above.31 However, we found no result below average, and four categories were assessed. Data regarding the day care center quality were also reclassified into two categories: good quality (score≥5) and poor quality (score<5). Data were processed using the SPSS Statistics 17 software (IBM Corporation, New York, United States of America). For normality test of fine motor performance, the Kolmogorov-Smirnov test was used, which indicated the non-normality of the data. Spearman's test was used to assess the relationship between fine motor development of children and extrinsic factors: quality and length of stay in day care centers, maternal education and socioeconomic status of the family. For correlation analysis, we used Dancey and Reidy classification33: rs=0.10-0.30 is a weak association; rs=0.40-0.60 is a moderate association; and rs=0.70-1 is a strong association, “s” refers to Spearman's test. A 5% significance level was adopted.