Table 1 Sample characteristics
From: Can the Edinburgh Postnatal Depression Scale-3A be used to screen for anxiety?
|  | Original EPDS validation sample (n = 320) | New sample (n  = 442) | Combined sample (N = 762) |
|---|---|---|---|
Maternal age, mean (SD) | 32.2 (4.6) | 31.9 (4.9)a | 32.1 (4.8)a |
 Range | 21–44 | 19–49 | 19–49 |
Infant age in weeks, mean (SD) | 15.8 (8.2) | 14.0 (7.3) | 14.8 (7.7) |
 Infant age 6–14 weeks | 209 (65.3) | 313 (70.8) | 522 (68.5) |
 Infant age 15–20 weeks | 57 (17.8) | 76 (17.2) | 133 (17.5) |
 Infant age 21–30 weeks | 29 (9.1) | 32 (7.2) | 61 (8.0) |
 Infant age 31–51 weeks | 25 (7.8) | 21 (4.8) | 46 (6.0) |
Infant sex, boys, n (%) | 172 (53.8) | 221 (50.0) | 393 (51.6) |
Infant gestational age, mean (SD) | 39.7 (2.0) | 39.5 (2.0) | 39.6 (2.0) |
 Range | 29.3–42.3 | 27.4–42.4 | 27.4–42.4 |
Infant prematurity, n (%) | 19 (5.9) | 38 (8.6) | 57 (7.5) |
Maternal country of origin | |||
 Danish, n (%) | 269 (84.1) | 320 (72.4) | 589 (77.3) |
 Immigrant, n (%) | 31 (9.7) | 37 (8.4) | 68 (8.9) |
 Descendants of immigrants, n (%) | 9 (2.8) | 2 (0.5) | 11 (1.4) |
 Missing, n (%) | 11 (3.4) | 83 (18.8) | 94 (12.3) |
Mother single parent or not | |||
 Married or living with partner, n (%) | 287 (89.7) | 332 (75.1) | 619 (81.3) |
 Single, n (%) | 14 (4.4) | 18 (4.1) | 32 (4.2) |
 Other, n (%) | 8 (2.5) | 9 (2.0) | 17 (2.2) |
 Missing, n (%) | 11 (3.4) | 83 (18.8) | 94 (12.3) |
Primiparous, n (%) | 192 (60.0) | 272 (61.5) | 464 (60.9) |
 Missing | 21 (6.6) | 82 (18.6) | 103 (13.5) |
Maternal ISCED level of education | |||
 Level 1–3, n (%) | 29 (9.1) | 26 (5.9) | 55 (7.2) |
 Level 4 and 5, n (%) | 37 (11.6) | 30 (6.8) | 67 (8.8) |
 Level 6, n (%) | 111 (34.7) | 141 (31.9) | 252 (33.1) |
 Level 7 and 8, n (%) | 133 (41.6) | 159 (36.0) | 292 (38.3) |
 Other or missing, n (%) | 10 (3.1) | 86 (19.5) | 96 (12.6) |