Table 2.

Vitamin B12 level changes across time while on metformin treatment

Duration of treatment	Vitamin B12 level (pg/mL)		P-value (2-tailed)
	MD (95% CI)	SEM
0 Month	0	N/A	Reference group
6 Months	-31.78 (-15.34 to 78.91)	23.85	0.185
12 Months	-4.92 (-49.06 to 58.90)	27.32	0.857
24 Months	-24.51 (-24.25 to 73.26)	24.69	0.322
36 Months	-48.28 (-7.44 to 103.99)	28.16	0.089

MD, mean difference; CI, confidence interval; SEM, standard error of the mean; N/A, not available.