Table 1 Summary of the observational study design, including the outcome and exposure variables assessed according to two levels, structure and components, and the data source
From: Accumulation of wear and tear in archival and library collections. Part II: an epidemiological study
Variable | Level | ||
|---|---|---|---|
1. Structure (inventory number) | 2. Component (single sheet) | ||
A. Stack loose records | B. Bindings | ||
Outcome | |||
Failure | |||
Number failed sheets (total) | Visual observation (counting) | Visual observation | – |
Number failed sheets (failure 1) | Visual observation (counting) | – | – |
Number failed sheets (failure 2) | Visual observation (counting) | – | – |
Number failed sheets (failure 3) | Visual observation (counting) | – | – |
Failed yes/no | – | Visual observation | – |
Failed part | – | Visual observation | – |
Failure category (0–3) | – | – | Visual observation |
Failure on fold | – | – | Visual observation |
Exposure | |||
Design | |||
Thickness (mm) | Physical measurement | Physical measurement | Physical measurement |
Weight (g) | Physical measurement | Physical measurement | – |
Height (mm) | Physical measurement | Physical measurement | – |
Width (mm) | Physical measurement | Physical measurement | – |
Number of sheets (total) | Visual observation (counting) | – | – |
Type of binding | – | Visual observation | – |
Binding material | – | Visual observation | – |
Maintenance | |||
Protection | Visual observation | Visual observation | – |
Prior owner | Collection management system | Collection management system | Collection management system |
Presence of fold | – | – | Visual observation |
Usage | |||
Number requisitions in reading room since 1998 | Collection management system | Collection management system | Collection management system |
Number years inventory available to visitors | Collection management system | Collection management system | – |
Date (age) | Collection management system | Collection management system | Collection management system |
Manufacture | |||
Paper type | – | – | Near infrared spectrometry (SurveNIR) |
pH | – | – | |
Degree of polymerization | – | – | |
Tensile strength (N) | – | – | |
Tensile strength folded (N) | – | – | |
Protein content (%) | – | – | |
Rosin content (mg/g) | – | – | |
Lignin content (mg/g) | – | – | |