Table 1 Characteristics of MDD patients and age-sex-matched controls

Age (years) at index date, N (%)

 45 or younger

6215 (54.6 %)

6218 (54.7 %)

 Between 46 and 60

2732 (24.0 %)

2737 (24.1 %)

 Over 60

2528 (21.3 %)

2420 (21.3 %)

Sex, female N (%)

7424 (65.3 %)

7423 (65.3 %)

Race, white N (%)

10,011 (88.0 %)

10,706 (94.1 %)

Education at index date

 High school or less

3496 (30.7 %)

3708 (32.6 %)

 Some college

3341 (29.4 %)

3788 (33.3 %)

 College degree (4-year)

1779 (15.6 %)

1653 (14.5 %)

 Post-graduate

1821 (16.0 %)

1383 (12.2 %)

 Unknown

938 (8.3 %)

843 (7.4 %)

Diagnosed obesity, N (%)

699 (6.2 %)

382 (3.4 %)

Number of chronic conditions, one or more N (%)

 Overall

4741 (41.2 %)

3632 (31.9 %)

  45 or younger^a

 1541 (24.8 %)

 957 (15.4 %)

  Between 46 and 60^a

 1360 (49.8 %)

 1031 (37.7 %)

  Over 60^a

 1840 (75.8 %)

 1644 (67.9 %)