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. 2014 Jan 27;9(1):e86925. doi: 10.1371/journal.pone.0086925

Table 1. Explanatory variables used in the analyses (act = actinic, MV = mercury vapour).

Variable Type Levels Used in GAMM as
Trap type nominal Skinner & Robinson Random factor
Bulb type nominal 15W act, 20–40W act, 60W act, 80W MV, 125W MV, 160W blended Random factor, nested within trap
Altitude continuous, m asl – Fixed factor
Garden microhabitats continuous, count – Fixed factor
Garden size nominal >50 m2, 50–200 m2, 200–400 m2, >400 m2 Fixed factor
Latitude & Longitude continuous, decimal degrees – Smoothing spline
Soil type nominal Acid, Neutral & Basic Fixed factor
Urbanization nominal Urbanized & Rural Fixed factor
Distance to field nominal Adjacent, <50 m, 50 m–2 km, >2 km Fixed factor
Distance to streetlight nominal Adjacent, <50 m, 50 m–2 km, >2 km Fixed factor
Distance to wood nominal Adjacent, <50 m, 50 m–2 km, >2 km Fixed factor
Distance to water nominal Adjacent, <50 m, 50 m–2 km, >2 km Fixed factor
Distance to coast nominal 0–2 km, >2 km Fixed factor