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Fig. 1 | Respiratory Research

Fig. 1

From: Impact of COPD and anemia on motor and cognitive performance in the general older population: results from the English longitudinal study of ageing

Fig. 1

Flowchart. Data used in main model 1 were based on participants for whom blood sample measurements from nursing datasets were available and who also had complete and consistent data on chronic obstructive pulmonary disease (COPD) as well as other variables included in model M1. To maintain the size and representativeness of the panel during waves 3, 4, and 6 additional study participants were recruited. The numbers given in the boxed therefore represent the sum of participants measured for the first time and participants who were already measured at a previous wave. The numbers of participants who continued with complete model 1 data from a previous to next waves are indicated above the arrows connecting the boxes from wave 2 to 4 (w2, w4) and 4 to 6 and for the total number of cases including all COPD subgroups also those that continue from w2 directly to w6. Updated values were used at each measurement time point. The dataset includes 8351 measurements collected over the three waves from 5709 participants

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