We then constructed cross-sectional trajectories that were compared to those of controls.
To further characterize these offspring, the aim of the present study was to inspect the stability or the variations of IQ and memory impairments across four age periods from 7 to 22, by constructing cross-sectional trajectories.
By means of cross-sectional trajectories studied in offspring at high genetic risk, our objective herein was to look at the stability or the variations of the IQ and episodic memory impairments in four different age periods from the primary school years through adolescence up to adulthood.
When the cross-sectional trajectories in Figure 2 were further inspected, the delays in visual memory were moderate at 7 12 years (ES = −.66 and −.52 respectively for RCFT immediate recall and RCFT delayed recall), increased in young adolescence (ES = −1.52 and −1.53) and through late adolescence, and ended up closer to controls at age 20 22 (ES of respectively −.32 and −.40).
Although grip strength declined with increasing age in all three studies, the cross-sectional trajectories suggest that the decline was steeper among men in Denmark and the US than in women within each country, but it was similar in Japanese men and women.
This is illustrated in Fig. 1, which shows age-specific (cross-sectional) average trajectories for the 9 waves of the National Population Health Survey of Canadian aged 20+ years, over 16 years of follow-up, repeated every 2 years.
Secondary analysis explored whether key predictors of the HADS and CRA observed in previous cross sectional analyses determined the trajectories of caregiving reactions and carer well-being during the intervention [ 28, 29].
There are a number of well-established advantages of longitudinal, compared with cross sectional, data in clarifying causes, trajectories and consequences of behaviours such as alcohol use (Muthen and Muthen, 2000).
The cross-sectional view and an incoming electron trajectory are shown in b.
Studies would need to report individual weight gain trajectories, rather than cross sectional means, for us to summarise these changes.
