Table 3.
Description of all microcephaly cases and neural only cases*. Values are numbers (percentages)
| Characteristic | All microcephaly cases (n=552) | Neural only cases (n=230) |
|---|---|---|
| Live born | 525 (95.1) | 229 (>99) |
| Stillborn | 25 (4.5) | 1 (0.4) |
| All perinatal deaths | 159 (28.8) | 17 (7) |
| Male | 227 (41.1) | 92 (40) |
| Female | 315 (57.1) | 138 (60) |
| Intersex | 8 (1.4) | 0 |
| Twin | 14 (2.5) | 8 (3) |
| Prenatally diagnosed | 175 (31.7) | 51 (22) |
| Preterm (<37 weeks) | 195 (35.3) | 51 (22) |
| Term not specified | 32 (5.8) | 17 (7) |
| Low birth weight (<2500 g) | 296 (53.6) | 94 (41) |
| Birth weight z score not calculated | 46 (8.3) | 29 (13) |
| Birth weight <−2 SD | 134/506 (26.5) | 40/201 (20) |
| Birth weight <−3 SD | 33/506 (6.5) | 7/201 (3) |
| 2010-14 only | ||
| All data: | 235 (42.6) | 95 (41) |
| HC z score not calculated† | 51/235 (22) | 8/95 (8) |
| HC<−3 SD | 82/184 (45) | 38/87 (44) |
| −2 SD≤HC≥−3 SD | 44/184 (24) | 27/87 (31) |
| −1 SD≤HC>−2 SD | 37/184 (20) | 18/87 (21) |
| HC>−1 SD | 21/184 (11) | 4/87 (5) |
| Preterm: | 55/184 (30) | 15/87 (17) |
| HC<−3 SD | 21/55 (38) | 8/15 (53) |
| −2 SD≤HC≥−3 SD | 8/55 (15) | 2/15 (13) |
| −1SD≤HC>−2 SD | 14/55 (25) | 4/15 (27) |
| HC>−1 SD | 12/55 (22) | 1/15 (7) |
| Term: | 129/184 (70) | 72/87 (83) |
| HC<−3 SD | 61/129 (47) | 30/72 (42) |
| −2 SD≤HC≥−3 SD | 36/129 (28) | 25/72 (35) |
| −1 SD≤HC>−2 SD | 23/129 (18) | 14/72 (20) |
| HC>−1 SD | 9/129 (7) | 3/72 (4) |
HC=head circumference.
*Two cases were unspecified as to whether live born or stillborn and for sex.
†z score not calculated as sex not specified (2), intersex (4), gestational age not specified (1), gestational age outside Intergrowth range (24-42 weeks+6 days) (8), or head circumference not specified (43).