Table 2.

Differences in reference sound levels between uncontrolled and controlled groups by device models.

Model	Number of calibrations in the uncontrolled group	Number of calibrations in the controlled group	Difference between reference sound levels in groups, dB (SD)
HTC ONE	99	2	−0.75 (4.58)
SAMSUNG GT-I8190	43	5	4.99 (5.16)
SAMSUNG GT-I9100	94	1	1.29 (3.92)
SAMSUNG GT-I9105P	26	3	3.35 (3.06)
SAMSUNG GT-I9195	83	3	5.80 (4.25)
SAMSUNG GT-I9300	100	7	−0.04 (4.29)
SAMSUNG GT-I9505	108	5	0.45 (4.43)
SAMSUNG GT-N7100	88	1	4.78 (4.28)
SONY C6603	62	2	−1.14 (4.31)
SONY C6903	55	2	−3.73 (5.94)