Table 1.
Measurements Taken in the Pregnancy, Infection, and Nutrition Study (PIN) Protocol
| Data collection time point | Median gestational age in weeks at collection (interquartile range) | Data or specimens collected pertinent to this analysis | Number available for this analysis (% of overall sample) |
|---|---|---|---|
| Initial recruitment | 15 (13–17) | 1587 | |
| Phone interview #1a | 19 (18–20) | Life Experiences Survey | 1536 (97%) |
| Perceived Stress Scale | 1534 (97%) | ||
| Self-administered questionnaire #1 | 16 (14–18) | State-Trait Anxiety Inventory | 1419 (89%) |
| Medical Outcome Study Social Support Scale | 1419 (89%) | ||
| Orr pregnancy-related anxiety | 1425 (90%) | ||
| Clinic visit #1b | 17 (16–18) | Saliva for cortisol (analysis limited to those collected between 8 and 10 a.m.) | 460 (29%) |
| 17 (16–19) | Blood for CRH | 1486 (94%) | |
| Phone interview #2 | 28 (27–29) | Perceived Stress Scale | 1422 (90%) |
| Rini pregnancy-related anxiety | 1423 (90%) | ||
| Self-administered questionnaire #2 | 27 (26–29) | Life Experiences Survey | 1241 (78%) |
| State Anxiety Inventory | 1233 (77%) | ||
| John Henryism Active Coping Scale | 1234 (78%) | ||
| Orr pregnancy-related anxiety | 1241 (78%) | ||
| Clinic visit #2 | 26 (25–28) | Saliva for cortisol (collected between 8 and 10 a.m.) | 353 (22%) |
| Blood for CRH | 1466 (92%) |
a
Completion of this interview was required to continue in the study.
b
This clinic visit was optional for the basic PIN protocol. Women who did not participate in this part of the study provided a saliva sample at recruitment.
CRH, corticotropin-releasing hormone.