Table 6

Descriptive data and score distributions for the postal GPAQ version 2 (n = 20,309)

GPAQ scale/item

N

Minimum

Maximum

Mean SD

% with lowest possible score

% with highest possible score

Alpha

Access (6 items)

19,418

0

100

58.8 (19.5)

0 (n = 11)

1.8 (n = 359)

0.88 (n = 8,277)*

Receptionists (1 item)

20,024

0

100

72.6 (21.8)

0.9 (n = 184)

23.7 (n = 4746)

n/a

Continuity of care (1 item)

18,290

0

100

66.6 (23.5)

1.6 (n = 288)

17.7 (n = 3240)

n/a

Communication (8 items)

18,463

0

100

77.0 (19.5)

0.1 (n = 24)

19.2 (n = 3554)

0.97 (n = 16,106)

Nursing care (3 items)

13941

0

100

76.4 (18.0)

0.2 (n = 28)

21.5 (n = 3003)

0.96 (n = 13,777)

* note that sample size for reliability analysis is much reduced due to the fact that 'don't' know/never needed to' responses to the two GPAQ telephone access questions are treated as missing for scale scoring purposes.

Mead et al. BMC Family Practice 2008 9:13   doi:10.1186/1471-2296-9-13