Agenda - 06-17-1987 - Laserfiche WebLink

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Daycare Effects on Preschool 9 The analysis of group effects on the trends across time (group * time effects) demonstrated that the groups also differed in the patterns of intellectual growth that were exhibited during the preschool years (F(6,232)=2.79, p<.05). Analysis of the linear trend revealed more of the tendency toward continual decline in IQ scores across time in CO M M U NIT Y:0-11 children than in the Co M M U NITY:12-52 children (F(1,118)=4.72, p<.05). Additionally, the comparisons of the EXPERIMENTAL children with all control children (F(1,118)=10.61, p<.01) and with only the C O M M U NIT Y:12-52 children (F(1,118)=7.95, p<.01) showed that the children attending the university-based daycare displayed less of a quadratic trend in their IQ scores over time. In other words, the analysis of the quadratic trend showed that the experimental group exhibited less of a "dip" in their IQ scores during late infancy than did all of the control children or the subgroup who had experienced at least some daycare. The final assessment of intellectual achievement during the preschool years was examined to estimate the size of group effects when these children entered public schools. The McCarthy General Cognitive Index at 54 months (G CI54) showed marked group effects (F(2,118)=13.49, p<.0001). The contrasts revealed that the E XP E RI M E N T AL children significantly outscored both all control children (F(1,118)=17.15, p .0001). The treatment intensity hypothesis was supported; the experimental children significantly outscored the CO M M U NIT Y:12-52 group (F(1,118=7.84, p=.006), while the COMM U NIT Y:12-52 group tended to score higher than the CO M M U NITY:0-11 group (F(1,118)=7.85, p=.006). The means for the three groups were 101.4 for the EXPERIMENTAL group, 95.1 for the CO M M U N IT Y:12-52 group, and 86.5 for the COMM U NIT Y:0-11 group. Thus, the best estimate of the size of the effect of some corn m unity daycare over little to no daycare is 8.6 points (over half of a standard deviation on the IQ test) and of university-based daycare over some corn m unity daycare is 6.3 points (about one-third of a standard deviation).