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Partial regression plots between total, Gram-negative, or Gram-positive bacteria, or mixed microbial exposure index I [MMEI (I)] and nonzero continuous observational dampness scores after adjusting for the school effect: x-axis = residual of nonzero observational dampness scores (N = 76) regressed against school; y-axis: residual of levels of bacteria or mixed microbial exposure index regressed against school
