Table 1.
General characteristics of the 2016 birth cohort, Israel
| Characteristics | Total (n = 181,543) |
|---|---|
| Gender, No. (%) | |
| Male | 93,434 (51.5) |
| Female | 88,109 (48.5) |
| Birthweight – categorical, No. (%) | |
| 2500 g | 167,647 (92.3) |
| 2000–2499 g | 9,661 (5.3) |
| 1500–1999 g | 2,629 (1.4) |
| 1000–1499 g | 1025 (0.6) |
| 1000 g | 580 (0.3) |
| Birthweight – continuous (gram) | |
| Mean [SD] | 3200.0 [530.0] |
| Median [IQR] | 3240.0 [2920.0–3550.0] |
| Gestational age at birth (weeks) | |
| Mean [SD] | 39.0 [1.9] |
| Median [IQR] | 39.0 [38.0–40.0] |
| Gestational age at birth – categorical, No. (%) | |
| 37 weeks | 168,835 (93.0) |
| 32–36 weeks | 11,074 (6.1) |
| 28–31 weeks | 1,089 (0.6) |
| 28 weeks | 545 (0.3) |
| Birth order – categorical, No. (%) | |
| First born | 51,870 (28.6) |
| Second born | 49,060 (27.0) |
| Third born | 35,845 (19.7) |
| Fourth born and above | 44.768 (24.7) |
| Number of children – categorical, No. (%) | |
| Singleton | 173,737 (95.7) |
| Multiple | 7,806 (4.3) |
| Ethnicity, No. (%) | |
| Jews & Others | 140,233 (77.2) |
| Arabs | 41,310 (22.8) |
| Socioeconomic rank (1–10) | |
| Rank 1–3 | 77,451 (42.7%) |
| Rank 4–7 | 73,748 (40.6%) |
| Rank 8–10 | 30,344 (16.7%) |
| Month of birth, categorical, No. (%) | |
| January–March | 44,618 (24.6) |
| April–June | 42,856 (23.6) |
| July–September | 47,752 (26.3) |
| October–December | 46,317 (25.5) |
| Length of hospital stay, categorical, No. (%) | |
| 1–6 d | 171, 313 (94.4) |
| 7–29 d | 8,097 (4.5%) |
| 30 d or more | 2133 (1.2%) |
Abbreviations: SD, standard deviation; IQR, interquartile range.