Birthweight, gestational age, and early school trajectory

BMC Public Health

Table 1 Baseline characteristics of participants

Characteristics	Sample 1 School entry		Sample 2 Repetition		Sample 3 Dropout
Characteristics	N (13,676)	%	N (3152)	%	N (3498)	%
Birthweight
≤ 1999	227	1.7	34	1.1	39	1.1
2000–2499	1384	10.1	265	8.4	302	8.7
≥ 2500	10,472	76.6	2590	82.2	2862	81.8
Missing	1593	11.6	263	8.3	295	8.4
Gestational age
≤ 31	466	3.4	94	3.0	109	3.1
32–36	2666	19.5	734	23.3	803	23.0
≥ 37	10,059	73.6	2242	71.1	2494	71.3
Missing	485	3.5	82	2.6	92	2.6
Child’s sex
Male	6820	49.9	1557	49.4	1718	49.1
Female	6856	50.1	1595	50.6	1780	50.9
Birth rank
1	5621	41.1	1216	38.6	1374	39.3
2	2749	20.1	767	24.3	855	24.5
3	1833	13.4	528	16.8	571	16.3
4 or more	1668	12.2	511	16.2	550	15.7
Missing	1258	9.2	130	4.1	148	4.2
Mother’s age at child’s birth (mean (sd))	13,659^¶	26.4 (5.8)	3146^§	26.3 (5.9)	3492 ^ρ	26.3 (5.9)
Mother’s education
None	6131	44.8	1473	46.7	1635	46.7
Some education	5878	43.0	1585	50.3	1752	50.1
Missing	1667	12.2	94	3.0	111	3.2
Household socioeconomic status
Less-poor	9809	71.7	2573	81.6	2841	81.2
poor	2528	18.5	579	18.4	655	18.7
Missing	1339	9.8	0	0.0	2	0.1
Place of residence
Formal	4624	33.8	1075	34.1	1211	34.6
Non formal	9052	66.2	2077	65.9	2287	65.4

ISSN: 1471-2458