Table:
Risk factors	Patients with risk factors accounting for the population of SMM	Probability of 2-year progression to symptomatic MM
Bone marrow plasma cells ≥ 60%	2–10%	90%
Serum-free light-chain ratio ≥ 100	15%	80%
Abnormal magnetic resonance imaging (>1 focal lesion)	15%	70%
High peripheral blood plasma cellsa	15%	70%

Parse the diagram content behind with markdown code: | Risk factors | Patients with risk factors accounting for the population of SMM | Probability of 2-year progression to symptomatic MM | 
 | --- |

--- | --- | 
 | Bone marrow plasma cells ≥ 60% | 2–10% | 90% | 
 | Serum-free light-chain ratio ≥ 100 | 15% | 80% | 
 | Abnormal magnetic resonance imaging (>1 focal lesion) | 15% | 70% | 
 | High peripheral blood plasma cellsa | 15% | 70% |