Fig. 3

The HbA1c trajectory groups during the follow-up. Low and stable, characterized by maintaining low HbA1c levels throughout follow-up; U-shape, the HbA1c was decreased first and reached the bottom at around two years, then the HbA1c increased during the next following time; Moderate-decrease, starting with an average HbA1c level and experiencing a slight decrease; Relative-high, maintaining high HbA1c levels throughout follow-up