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Table 2 Results of t-tests and descriptive statistics on the percentage of failed sheets within an inventory number grouped by number of requisitions in the reading room since 1998 and prior owner

From: Accumulation of wear and tear in archival and library collections. Part II: an epidemiological study

Exposure variable Outcome variable: failed sheets (%) n 95% CI for mean difference t df p
M SD SE
Reading room < 8× 18.1 25.6 2.2 136 − 25.1, − 9.9 − 4.58 100 < 0.001
Reading room ≥ 8× 35.6 22.2 3.1 50
Owner: private 25.3 28.6 3.0 94 − 2.3, 12.6 − 1.37 176 0.173
Owner: government 20.2 22.6 2.4 92
  1. M, mean; SD, standard deviation; SE, standard error of the mean; n, number of observations; CI, confidence interval; t, t test; df, degrees of freedom; p, p value