Table 2.

r² Values by Different Sampling Schemes (n = 334 Analysis Intervals from 185 Subjects)

	Sampled data vs. 3 months of full data
	3 daysa	6 daysa	9 daysa	12 daysa	15 daysa
Mean glucose (mg/dL)
Sampling at the end of 3 months	0.47	0.60	0.67	0.71	0.74
Sampling in the middle of 3 monthsb	0.52	0.63	0.70	0.74	0.80
Sampling once per monthc	0.58	0.66	0.70	0.76	0.81
Percentage of values in range (71–180 mg/dL)
Sampling at the end of 3 months	0.42	0.57	0.66	0.71	0.73
Sampling in the middle of 3 monthsb	0.47	0.60	0.68	0.71	0.77
Sampling once per monthc	0.51	0.61	0.68	0.74	0.79
Percentage of values >180 mg/dL
Sampling at the end of 3 months	0.47	0.60	0.69	0.72	0.75
Sampling in the middle of 3 monthsb	0.50	0.62	0.69	0.73	0.78
Sampling once per monthc	0.54	0.64	0.69	0.74	0.79
Coefficient of variationd
Sampling at the end of 3 months	0.36	0.50	0.59	0.65	0.70
Sampling in the middle of 3 monthsb	0.43	0.54	0.62	0.70	0.73
Sampling once per monthc	0.40	0.57	0.63	0.71	0.74
Percentage of values ≤70 mg/dL
Sampling at the end of 3 months	0.32	0.47	0.56	0.63	0.66
Sampling in the middle of 3 monthsb	0.37	0.52	0.60	0.65	0.70
Sampling once per monthc	0.38	0.50	0.59	0.65	0.70

^aTotal days over the 3-month interval.

^bn = 333 (excludes one interval that was not eligible for the analysis of sampling in the middle of 3 months).

^cSampling once per month (in the middle of month) for 3 months. Divide the number in the cell by 3 to get the number of days that were sampled per month.

^dDefined as SD divided by mean glucose.