Table 1.
Characteristics of the study groups
| Characteristic | Study groups | All cases | Macedonian | Albanian | Other | ||||
|---|---|---|---|---|---|---|---|---|---|
| n (%) | MA±SD | n (%) | MA±SD | n (%) | MA±SD | n (%) | MA±SD | ||
| n=768 | 32.9±5.35 | n=528 | 34.14±4.90 | n=208 | 33.16±5.46 | n=32 | 31.90±5.68 | ||
| Maternal age | ≤30 | 265 (34.50) | 27.19±2.56 | 131 (24.81) | 27.82±2.18 | 121 (58.17) | 26.53±2.72 | 13 (40.62) | 26.92±3.22 |
| 31–35 | 241 (31.37) | 32.87±1.39 | 178 (33.71) | 32.89±1.40 | 52 (25.00) | 32.82±1.41 | 11 (34.37) | 32.27±0.90 | |
| ≥36 | 262 (34.11) | 38.96±2.39 | 219 (41.47) | 38.94±2.31 | 35 (16.82) | 39.02±2.61 | 8 (25.00) | 39.5±3.46 | |
| ND | / | / | / | / | / | / | / | / | |
| History of PL | Sporadic | 268 (34.89) | 33.16±5.26 | 202 (38,25) | 33.95±4.78 | 48 (23,07) | 29.60±5.55 | 18 (56,25) | 33.61±5.81 |
| RPL | 259 (33,72) | 33.1±5.24 | 164 (31,06) | 34.67±4.71 | 86 (41,34) | 30.56±5.11 | 9 (28,12) | 28.77±4.14 | |
| ND | 241 (31,38) | / | 162 (30,68) | / | 74 (35,57) | / | 5 (15,62) | / | |
| Previous live birth | Yes | 142 (18,48) | 34.66±4.75 | 95 (17,99) | 35.76±4.48 | 41 (19,71) | 32.82±4.64 | 6 (18,75) | 29.66±2.25 |
| No | 383 (49,86) | 32.57±5.32 | 269 (50,94) | 33.77±4.76 | 93 (44,71) | 29.07±5.15 | 21 (65,62) | 32.66±6.26 | |
| ND | 243 (31,64) | / | 164 (31,06) | / | 74 (35,57) | / | 5 (15,62) | / | |
| Maternal ABO group | 0 | 183 (23,821) | 33.09±5.52 | 123 (23,29) | 34.73±4.98 | 55 (26,44) | 29.38±4.98 | 5 (15,62) | 33.60±4.72 |
| A | 183 (23,82) | 33.61±4.95 | 138 (26,13) | 34.41±4.60 | 40 (19,23) | 31.32±4.99 | 5 (15,62) | 30.00±7.68 | |
| B | 67 (8,72) | 32.82±5.03 | 46 (8,71) | 33.91±4.63 | 15 (7,21) | 30.46±5.99 | 6 (18,75) | 30.33±2.42 | |
| AB | 36 (4,68) | 31.63±5.57 | 21 (3,97) | 33.33±5.38 | 9 (4,32) | 28.11±5.46 | 6 (18,75) | 31.00±4.28 | |
| ND | 299 (38,93) | / | 200 (37,87) | / | 89 (42,78) | / | 10 (31,25) | / | |
| Maternal RhD status | RhD+ | 410 (53,38) | 33.19±5.26 | 288 (54,54) | 34.4±4.81 | 102 (49,03) | 30.14±5.23 | 20 (62,5) | 31.30±5.00 |
| RhD− | 59 (7,68) | 32.91±5.21 | 40 (7,57) | 34.3±4.75 | 17 (8,17) | 29.64±5.08 | 2 (6,25) | 30.00±2.82 | |
| ND | 299 (38,93) | / | 200 (37,87) | / | 89 (42,78) | / | 10 (31,25) | / | |
| Gestational week | 6 | 36 (4,68) | 33.02±4.64 | 24 (4,54) | 34.66±3.71 | 11 (5,28) | 29.90±4.90 | 1 (3,12) | 28.00±0.00 |
| 7 | 80 (10,41) | 34.27±5.29 | 58 (10,98) | 34.75±4.98 | 16 (7,69) | 31.93±5.37 | 6 (18,75) | 35.83±7.02 | |
| 8 | 102 (13,28) | 32.89±5.43 | 71 (13,44) | 34.45±5.05 | 26 (12,5) | 29.53±4.53 | 5 (15,62) | 28.20±5.21 | |
| 9 | 65 (8,46) | 32.21±5.28 | 46 (8,71) | 32.91±4.83 | 17 (8,17) | 30.23±5.99 | 2 (6,25) | 33.00±8.48 | |
| 10 | 33 (4,29) | 33.72±5.51 | 24 (4,54) | 34.91±4.97 | 7 (3,36) | 31.14±6.54 | 2 (6,25) | 28.5±3.53 | |
| 11 | 39 (5,07) | 30.74±4.98 | 26 (4,92) | 31.65±4.31 | 11 (5,28) | 29.27±6.35 | 2 (6,25) | 27.00±1.41 | |
| ND | 413 (53,77) | / | 279 (52,84) | / | 120 (57,69) | / | 14 (43,75) | / | |
| Fetal sex | Male | 379 (49.34) | 33.03±5.26 | 264 (50.00) | 34.09±4.74 | 101 (48.55) | 30.21±5.46 | 14 (43.75) | 33.42±6.01 |
| Female | 389 (50.65) | 32.93±5.44 | 264 (50.00) | 34.19±5.06 | 107 (51.44) | 30.20±5.27 | 18 (56.25) | 30.72±5.28 | |
| Total | 768 (100.00) | / | 528 (100.00) | / | 208 (100.00) | / | 32 (100.00) | / | |
MA, mean age; SD, standard deviation; ND, no data