Table 1
Sigma values of point-of-care glucose testing for 15 months

Ward	Sigma value		Mean*
	Low level control	High level control
	A	3.98		6.87	5.43
B	3.61	6.22	4.91
C	4.71	4.90	4.81
D-1	3.17	5.93	4.55
D-2	3.35	5.45	4.40
E	4.17	3.64	3.91
F	4.39	3.41	3.90
G-1	3.97	3.55	3.76
H	3.77	3.59	3.68
I-1	3.95	3.14	3.55
I-2	3.85	3.22	3.53
J	3.73	3.32	3.53
K-1	3.15	3.74	3.44
L	3.14	3.72	3.43
M	3.61	3.18	3.39
N	3.53	3.24	3.39
O	2.93	3.72	3.33
K-2	2.70	3.70	3.20
G-2	3.10	3.24	3.17
P	3.23	3.07	3.15
Q	2.93	3.28	3.10
R	2.78	3.25	3.02
S	2.86	3.17	3.01
T	2.61	3.38	2.99
U	2.59	3.24	2.92
V	3.07	2.54	2.80
W	2.32	3.19	2.75
X	2.21	3.24	2.73
Y	2.70	2.50	2.60
Z	2.50	2.53	2.51
Mean	3.29	3.71	3.49

^*Mean was calculated as (sigma low+ sigma high)/2.