Human intestinal microbiota profiling data with HITChip. Citation: L. Lahti, J. Salojärvi, A. Salonen, M. Scheffer, W.M. de Vos. Tipping elements in the human intestinal ecosystem. Nature Communications 2014. Contact: leo.lahti@iki.fi Data description: * HITChip.tab: a tab-separated text file containing HITChip phylogenetic microarray data matrix for 1006 western subjects with altogether 1172 samples x 130 genus-like groups. The data provides the absolute HITChip signal estimate, preprocessed with min-max normalization and fRPA probe summarization as described in the main article and references. * Metadata.tab: a tab-separated text file containing the metadata for the samples in the HITChip data matrix. Most variables are rounded or aggregated to ensure subject anonymity. The 'NA' refers to missing values. The variable units and other information are as follows: - SampleID: unique sample identified corresponding to the samples in the HITChip data matrix - Age (years; rounded to the closest integer) - Sex (male/female) - Nationality: at the level of geographic regions; for details see the main article - DNA_extraction_method (r: Repeated Bead Beating, o: other) - ProjectID: project identifier; samples are aggregated from many projects - Diversity: Shannon diversity index based on probe-level signals - BMI_group: Standard body-mass index classification (underweight: <18.5; lean: 18.5-25; overweight: 25-30; obese: 30-35; severe obese: 35-40; morbid obese 40-45; superobese >45) - SubjectID: Subject identifier (some subjects have multiple time points) - Time: Time point (months from the baseline). Most samples have only the baseline (0) time point