b. Reggio Emilia municipality	N°	N°	%	N°	N°	%
All	792	388	49.0%	803	651	81.1%
Mother identified	715	357	49.9%	730	593	81.2%
Mother not identified	77	31	40.3%	73	58	79.5%
Mother’s age at birth
<20	18	6	33.3%	22	18	81.8%
20–34	605	307	50.7%	584	479	82.0%
>34	92	44	47.8%	124	96	77.4%
Years of education
>12, graduate	65	23	35.4%	78	66	84.6%
>12, non-graduate	261	147	56.3%	280	225	80.4%
8–11	321	165	51.4%	318	265	83.3%
≤7	65	22	33.9%	52	35	67.3%
Missing	3	0	0.0%	2	2	100.0%
Citizenship
Italian	609	326	53.5%	608	493	81.1%
Foreign	106	31	29.2%	122	100	82.0%
Single parent
Yes	87	44	50.6%	88	74	84.1%
No	628	313	49.8%	642	519	80.8%
Sibling
No	161	85	52.8%	162	130	80.2%
Yes	554	272	49.1%	568	463	81.5%
Screening history
Non-participant	89	29	32.6%	90	62	68.9%
Irregular participant	335	164	49.0%	341	283	83.0%
Regular participant	285	162	56.8%	295	245	83.1%
Missing	6	2	33.3%	4	3	75.0%