Table 1. Characteristics according to age (≥65 or <65 years).
| Variables | Total (n=30) | Elderly (n=9) | Younger (n=21) | P |
|---|---|---|---|---|
| Age (years) | 53.1±18.0 | 70.8±3.1 | 45.5±16.3 | |
| Gender (male/female) | 9/21 | 2/7 | 7/14 | 0.54 |
| Smoking history (yes/no) | 7/23 | 1/8 | 6/15 | 0.30 |
| PS (0/1/2/3) | 16/9/2/3 | 6/1/0/2 | 10/8/2/1 | 0.19 |
| BMI (kg/m2) | 22.2±3.4 | 22.5±2.7 | 22.1±3.7 | 0.79 |
| VC (% of predicted) | 98.8±20.1 | 103.1±16.8 | 97.0±18.6 | 0.45 |
| Thymoma (present/absent) | 11/19 | 3/6 | 8/13 | 0.80 |
| Autoantibody (elevated/normal) | 27/3 | 9/0 | 18/3 | 0.23 |
| MGFA (I/II/III/IV/V) | 5/19/4/1/1 | 2/5/2/0/0 | 3/14/2/1/1 | 0.45 |
| Onset (<50/≥50 years) | 10/20 | 0/9 | 10/11 | 0.0112 |
| Length from onset to surgery (<1/≥1 year) | 19/11 | 5/4 | 14/7 | 0.56 |
| QMG score | 12.4±4.8 | 12.3±6.5 | 12.5±4.0 | 0.90 |
| Surgical approach (open/VATS) | 4/26 | 2/7 | 2/19 | 0.35 |
Data are expressed as the number or mean ± standard deviation. PS, performance status; BMI, body mass index; VC, vital capacity; MGFA, the Myasthenia Gravis Foundation of America; QMG score, Quantitative Myasthenia Gravis Score for Disease Severity; VATS, video-assisted thoracic surgery.