Table 1.

Criteria used to determine whether proteins are differentially present

Abundance	SC range	NSAF ratio	P-value
Very low	1.7–7	0.4 ≤ NSAF ratio ≥ 2.5	≤0.01
Low	8–19	0.5 ≤ NSAF ratio ≥ 2.0	≤0.01
Medium	20–79	0.5 ≤ NSAF ratio ≥ 2.0	≤0.05
High	80+	0.67 ≤ NSAF ratio ≥ 1.5	≤0.05

SC = spectral count; NSAF = normalized spectral abundance factor