Table 2.

Distribution of gastroschisis cases and controls by neighborhood indices, NDI and nSEPI, n(%)

	Gastroschisis Cases n = 1,269	Controls n = 10,217
Neighborhood Deprivation Index (NDI)
T1 (Low deprivation)	246 (19)	3406 (33)
T2	454 (36)	3406 (33)
T3 (High deprivation)	569 (45)	3405 (33)
Neighborhood Socioeconomic Position Index (nSEPI)
T1 (High nSEP)	240 (19)	3406 (33)
T2	449 (35)	3406 (33)
T3 (Low nSEP)	580 (46)	3405 (33)

Neighborhood indices were created within each imputed dataset via principal component analysis. Counts and frequencies were averaged over the 10 imputed datasets.

NDI: Neighborhood Deprivation Index; nSEPI: Neighborhood Socioeconomic Position Index: nSEP: Neighborhood Socioeconomic Position

High tertile scores reflect high deprivation (NDI) or lower nSEP (nSEPI). Low tertile scores reflect low deprivation (NDI) or high nSEP (nSEPI).