A table contains the gene-level test result, and the table contains these columns:
`gene`: Theg gene name to be tested.
`n_sgrna`: The number of sgRNA targets the gene in the library.
`cpm_a`: The mean of CPM of sgRNAs within the first group.
`cpm_b`: The mean of CPM of sgRNAs within the second group.
`logFC`: The log fold change of the gene between two groups.
`p_ts`: The p-value indicates a difference between the two groups at the gene-level.
`p_pa`: The p-value indicates enrichment of the first group at the gene-level.
`p_pb`: The p-value indicates enrichment of the second group at the gene-level.
`fdr_ts`: The adjusted P-value of `p_ts`.
`fdr_pa`: The adjusted P-value of `p_pa`.
`fdr_pb`: The adjusted P-value of `p_pb`.