Gestational age data completeness, quality and validity in population-based surveys: EN-INDEPTH study

Haider, M. Moinuddin; Mahmud, Kaiser; Blencowe, Hannah; Ahmed, Tahmeed; Akuze, Joseph; Cousens, Simon; Delwar, Nafisa; Fisker, Ane B.; Ponce Hardy, Victoria; Hasan, S. M. Tafsir; Imam, Md. Ali; Kajungu, Dan; Khan, Md Alfazal; Martins, Justiniano S. D.; Nahar, Quamrun; Nettey, Obed Ernest A.; Tesega, Adane Kebede; Yargawa, Judith; Alam, Nurul; Lawn, Joy E.

doi:10.1186/s12963-020-00230-3

Population Health Metrics

Table 4 GA in months, weeks and ‘born before expected’ in the last 5 years, EN-INDEPTH survey

From: Gestational age data completeness, quality and validity in population-based surveys: EN-INDEPTH study

	HDSS sites					All sites
	Bandim	Dabat	IgangaMayuge	Kintampo	Matlab
Number of women	9109	6254	5632	11,411	18,508	50,914
Panel A: Gestational age in months for livebirths in the last 5 years preceding start of survey
Number of livebirths in the last 5 years	12,002	8295	8508	15,758	20,999	65,562
Implausible (≤ 5 months)	0.2	0.1	0.4	0.3	0.4	0.3
Plausible (≥ 6 months)	99.4	99.9	99.6	99.5	99.5	99.5
Do not know/missing	0.4	0.0	0.0	0.2	0.2	0.2
Total	100%	100%	100%	100%	100%	100%
Preterm birth rate^a (CI)	1.7 (1.5, 1.9)	0.8 (0.6, 1.0)	3.0 (2.7, 3.4)	1.4 (1.2, 1.6)	17.0 (16.5, 17.5)	8.0 (6.4, 6.8)
Panel B: Gestational age in weeks for last livebirths in the last 5 preceding start of survey
Number of last livebirth in sub-sample (weighted)	2817	1978	2011	3629	4650	15,086
Implausible (≤ 21 weeks)	0.4	0.8	1.4	0.8	9.8	3.6
Plausible (≥ 22 weeks)	5.1	91.4	96.6	50.7	89.8	65.7
Do not know/missing	94.5	7.8	2.0	48.5	0.3	30.7
Total	100%	100%	100%	100%	100%	100%
Preterm birth rate^a (CI)	59.5 (50.5, 67.1)	96.6 (95.6, 97.4)	69.4 (67.3, 71.4)	71.5 (69.4, 73.6)	20.9 (19.7, 22.2)	54.2 (53.2, 55.2)
Panel C: Babies ‘born before expected’ for livebirths in the last 5 years preceding start of survey^b
Number of last livebirth in sub-sample (weighted)	2817	1978	2011	3629	4650	15,086
Implausible (≤ 21 weeks)	0.3	0.1	1.2	0.2	0.1	0.3
Plausible (≥ 22 weeks)	88.3	98.6	98.4	95.6	98.8	96.0
Do not know/missing whether the baby was born before expected	9.8	1.2	0.3	3.8	0.4	3.1
The baby was born before expected but do not know how many weeks before expected	1.6	0.0	0.2	0.4	0.4	0.6
Total	100%	100%	100%	100%	100%	100%
Preterm birth rate^c (CI)	1.0 (0.7-1.5)	0.8 (0.5-1.3)	2.8 (2.1-3.6)	1.7 (1.3-2.2)	7.7 (6.9, 8.5)	3.5 (3.2-3.8)

^aPreterm birth rate was estimated amongst those who provided valid GA: GAm ≥ 6 and GAw ≥ 22
^bGAw was measured by subtracting number of weeks the child was ‘born before expected’ from 40 weeks. The survey did not ask when the baby was expected to be born. We have assumed 40 weeks for all babies
^cPreterm birth rate: GAw ≤ 36, like panel B. All ‘Don’t know/missing’ are excluded from the estimation

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