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However, specification choices related to obtaining accurate point estimates in difference-in-differences models--including the choice of comparison groups, the choice of the pre-intervention time interval, and addressing violations to the "parallel trends" assumption--have received scant attention in the literature.
In both healthy comparison groups and immunocompromised adults, IgM against Hia concentrations were higher than those of IgG, although the ratio was opposite for IgM and IgG isotypes of antibodies to Hib.
Responses of student participants in the SNC curriculum adoption group (intervention, n = 440) and in the comparison group (n = 249) to the BOE were analyzed using repeated-measures analyses of variance with baseline and one-year follow-up administrations as the repeated measures.
Most published studies that move beyond the impressionistic are limited by small samples, short-term exposure to the arts, self-report measurement bias, or lack of a comparison group.
On average, the IF group took roughly three times longer to reoffend than the comparison group, and the comparison group were convicted for five times as many substantive offences as the IF group.
The gait temporal-distance measurements during walking for exercise group and comparison group are shown in Table 2.
Few significant differences were found between intervention and comparison group characteristics; however, intervention group parents were significantly older (M = 44.
Table 5 presents ratios of base period to 6-month hospitalization rates for HF-only and diabetes mellitus-only beneficiaries for the intervention and comparison groups.
The purpose of this investigation was not to separate and examine individual components of the IMSE supplemental reading program; the purpose was to study the effectiveness of this program in a real-world setting in which the teachers in the treatment group implemented this program and the comparison group teachers did not.
In addition, there was also a significantly thicker endometrium in the treatment group after treatment than in the comparison group.
At pretest, no children in either treatment or comparison groups had scores that placed them in the higher stanines (7-9).
Table 1 Adolescents' social life, emotional state, and feelings toward parents, by research and comparison groups.

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