Table 1.

Age at brain scan, number of participants (by gender) providing scans for each age group, and total number of scans completed for each age group for NIHPD and MCBI.

Age	Days, Range	Days, Mean	Number of participants* Female / Male	Total number of brain scans**
2 weeks NIHPD	8–29	19.7	12 / 11	23
3 Months NIHPD	75–105	90.3	10 / 11	22
3 Months MCBI	95–110	103.3	6 / 4	10
4.5 Months MCBI	142–145	143.2	4 / 6	10
6 Months NIHPD	167–197	182.1	15 / 17	32
6 Months MCBI	179–203	194.8	5 / 5	10
7.5 Months MCBI	223–245	234.5	6 / 4	10
9 Months NIHPD	257–287	273.8	16 / 13	29
9 Months MCBI	274–288	281.6	2 / 2	4
12 Months NIHPD	352–376	366.2	11 / 14	25
12 Months MCBI	365–383	372.7	3 / 3	6
15 Months NIHPD	445–475	461.4	14 / 18	32
18 Months NIHPD	526–571	550.9	14 / 18	32
2.0 Years NIHPD	722–767	740.2	9 / 18	27
2.5 Years NIHPD	886–958	927.0	13 / 18	31
3.0 Years NIHPD	1080–1131	1107.5	13 / 9	22
4.0 Years NIHPD	1468–1552	1508.0	9 / 10	19

^*Number of participants (female / male) providing brain scans to the specific age-groups from NIHPD and MCBI. Note that an individual participant from the NIHPD could contribute a scan to multiple age groups based on the longitudinal design, not so for the MCBI [Participant pool: NIHPD = 105 (46 females/59 males), MCBI = 49 (25 females/24 males)].

^**Total number of brain scans completed for each specific NIHPD and MCBI age group.