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Table 2 HbA1c levels (mmol/mol) at different time points and estimated changes between and within groups

From: Effects of three frequencies of self-monitored blood glucose on HbA1c and quality of life in patients with type 2 diabetes with once daily insulin and stable control: a randomized trial

SMBG frequency Baseline 3 months 6 months 9 months Estimated changes within groupsa
Weekly (A) 51.1 ± 4.7 52.1 ± 5.4 52.2 ± 5.0 54.4 ± 6.8 3.32 (− 1.38, 8.01)
Every 2 weeks (B) 51.6 ± 4.6 51.3 ± 7.8 50.2 ± 5.8 53.1 ± 5.8 1.50 (− 4.01, 7.01)
Monthly (C) 51.2 ± 5.6 51.1 ± 5.6 50.2 ± 9.0 51.8 ± 6.6 0.60 (− 4.33, 5.53)
Time (months) Groupsb
B minus A C minus A C minus B
3 − 0.62 (− 4.83, 3.59) − 1.16 (− 5.10, 2.79) − 0.53 (− 4.83, 3.77)
6 − 2.40 (− 7.31, 2.51) − 2.51 (− 7.12, 2.10) − 0.11 (− 5.02, 4.80)
9 − 1.72 (− 5.60, 2.17) − 2.70 (− 6.35, 0.95) − 0.98 (− 4.94, 2.98)
  1. Data are mean ± SD, estimated changes (95% CI, Bonferroni corrected). All p values > 0.05
  2. aFrom baseline to 9 months
  3. bEstimated changes between groups adjusted for baseline differences