Table 1 Baseline characteristics of thalassemic women and controls.
From: Pregnancy outcomes in women affected by fetal alpha-thalassemia: a case control study
Characteristics | Control group (n = 437,382) | Women with the α-thalassemia trait* | P1§ (P2║) | ||
|---|---|---|---|---|---|
Normal fetal group (n = 446) | Fetal group with α-thalassemia trait† (n = 708) | Fetal group with HbH disease‡ (n = 211) | |||
Maternal age (y) | 0.100 (.254) | ||||
12–19 | 12,956 (2.96) | 11 (2.47) | 18 (2.54) | 11 (5.21) | |
20–34 | 346,994 (79.33) | 353 (79.15) | 573 (80.93) | 155 (73.46) | |
35–58 | 77,432 (17.70) | 82 (18.39) | 117 (16.53) | 45 (21.33) | |
Maternal anemia (Hb < 10 g/dL) | 37,864 (8.66) | 68 (15.25) | 133 (18.79) | 42 (19.91) | 0.213 (< .001) |
Number of prenatal visits > 10 | 206,526 (47.22) | 245 (54.93) | 376 (53.11) | 118 (55.92) | 0.709 (< .001) |
Gestational weeks at first visit | 0.051 (.062) | ||||
< 13 | 320,425 (73.26) | 317 (71.08) | 526 (74.29) | 139 (65.88) | |
13–42 | 116,957 (26.74) | 129 (28.92) | 182 (25.71) | 72 (34.12) | |
Gravidity | 0.461 (.069) | ||||
1 | 100,526 (22.98) | 105 (23.54) | 188 (26.55) | 57 (27.01) | |
2–23 | 336,856 (77.02) | 341 (76.46) | 520 (73.45) | 154 (72.99) | |
Parity | 0.080 (< .001) | ||||
Nulliparous | 165,076 (37.74) | 213 (47.76) | 331 (46.75) | 117 (55.45) | |
Parous | 272,306 (62.26) | 233 (52.24) | 377 (53.25) | 94 (44.55) | |
Ethnic group | 0.311 (< .001) | ||||
Han | 228,462 (52.23) | 185 (41.48) | 323 (45.62) | 94 (44.55) | |
Zhuang | 193,659 (44.28) | 244 (54.71) | 371 (52.40) | 111 (52.61) | |
Others | 15,261 (3.49) | 17 (3.81) | 14 (1.98) | 6 (2.84) | |
Residency in Guangxi province | 411,730 (94.14) | 442 (99.10) | 702 (99.15) | 209 (99.05) | 0.989 (< .001) |
