Table 2. Two- and three-way set comparisons of protein identifications from the EMF exposure experiments.

Human
A	B	|A|	|B|	|A ∩ B|	|A ∪ B|	% Overlap	J
						100 * |A ∩ B| / MAX(|A|, |B|)	|A ∩ B| / |A ∪ B|
ELF	UMTS	26419	22957	20711	28665	78.39	0.72
ELF	WiFi	26419	24174	21503	29090	81.39	0.74
UMTS	WiFi	22957	24174	20702	26429	85.64	0.78
Mouse
ELF	UMTS	13051	14106	11365	15792	80.57	0.72
ELF	WiFi	13051	13309	11108	15252	83.46	0.73
UMTS	WiFi	14106	13309	12154	15261	86.16	0.80
Human
A	B	C	-	|A ∩ B ∩ C|	|A ∪ B ∪ C|	% Overlap	J
						100 * |A ∩ B ∩ C| / MAX(|A|, |B|, |C|)	|A ∩ B ∩ C| / |A ∪ B ∪ C|
ELF	UMTS	WiFi	-	19389	30023	73.39	0.65
Mouse
ELF	UMTS	WiFi		10570	16409	74.93	0.64

Note that the Jaccard index (J) indicates the similarity between the sets (values between 0 and 1, i.e. complete dissimilarity and identity, respectively); the overlap score (%) indicates the percentage of protein identifications common to the sets with regard to the largest one; set operations such as union (∪), intersection (∩) and cardinality (|…|) are indicated in the headers.