pickets, thereby moveably securing the pickets to the rail. The sliding lock bar is held in place internally within the rail by one upwardly orient bottom lip, an interior side wall of the rail adjacent to that bottom lip, and interior top wall of the rail, and the notched pickets. Because each picket is provided with only one notch per rail and because the sliding lock bar is provided with only a single ridge to engage the associated notches in the pickets, the pickets are free to move in a plane that coincides with or includes the longitudinal axis of the rail, with the movement of the pickets limited only by the top opening in the rails and the ability of the sliding lock bars to move withinCharacterization of the duration from onset of asthma symptoms to asthma disease.
Little is known about factors associated with progression of childhood asthma from onset of symptoms to index date determined by medical records. To determine the duration between the onset of asthma symptoms to index date of asthma (ie, time when one met the criteria for asthma) and associated factors. Study participants came from a sample of 839 healthy children, aged 5 to 12 years, who had participated in a previous study. Comprehensive medical record reviews were conducted to determine first documentation of asthma symptoms and index date of asthma. Factors were evaluated for an association with the duration from onset of asthma symptoms to index date of asthma. Of the study sample, 222 children met the criteria