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. 2017 Oct 19;12(10):e0186233. doi: 10.1371/journal.pone.0186233

Fig 1. Confirmatory factor analysis.

Fig 1

Note: e = error, SO = problems with sleep onset, SM = problems with sleep maintenance, NA = negative affect. P = paranoia. Rectangular boxes represent indicator variables (e.g., items from the DASS-21) that have been parcelled together to form an average (e.g., SO1 and SO2 are parcels consisting of items representing sleep onset), ovals represent latent variables while circles represent error or disturbance.