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. 2014 Feb 11;9(2):e86281. doi: 10.1371/journal.pone.0086281

Table 3. Estimates of treatment effects on melt-out dates.

Melt-out dates TDD
Effect ± sd t-value p-value Effect ± sd t-value p-value
Intercept (Normal) 155±1.0 272.7±6.7
Removed −34±0.9 −39.9 <0.001 45.7±11.6 3.95 0.003
Shallow −5±0.7 −6.9 <0.001 10.7±9.3 1.16 0.253
Medium 8±0.6 14.1 <0.001 −26.4±9.6 −2.74 0.009
Deep 12±0.5 26.2 <0.001 −38.9±9.0 −4.35 <0.001
df 182 6180

Melt-out dates in days of year (doy) and on TDD (thawing degree days, i.e. positive air temperature sums in °C). Effect values other than the intercept (here: Normal treatment) are deviations from the latter. Normal = unmanipulated snow cover; Removed = snow removal on 1. May; Shallow = naturally early snowmelt; Medium = intermediately increased snow; Deep = maximally increased snow. Given are standard deviation (sd), t- and p-values and degrees of freedom (df) of the model.