6,993 responses from 999 respondents to 7 items.
| Description | 7-item Cognitive Reflection Test (CRT); item-level correctness (resp) and response time (rt, seconds) with treat = testosterone vs. placebo assignment. Double-blind, placebo-controlled RCT of intranasal testosterone (N=1,000 enrolled; 999 with usable CRT data). |
|---|---|
| Reference | Knight EL, Nave G, Shaw SD, Apicella C, Bonin PL, Dreber A, Geniole SN, Johannesson M, Manfredi D, Mehta P, Proietti V, Stanton SJ, Luberti FR, Ortiz T, Carre JM (2026). Does Testosterone Affect Cognitive Reflection? Evidence From a Double-Blind, Randomized Controlled Study of 1,000 Participants. Psychological Science, 37(7), 463-476. |
| DOI | 10.1177/09567976261458325 |
| Licence | CC0 1.0 |
| Source data | https://osf.io/37ycj/overview |
| Responses | 6,993 |
|---|---|
| Respondents | 999 |
| Items | 7 |
| Response categories | 2 |
| Responses per respondent | 7 |
| Responses per item | 999 |
| Density | 1 |
| Longitudinal | FALSE |
| sample | Program-based |
|---|---|
| measurement tool | Test |
| item format | Constructed Response |
This table has item text in the IRW: the wording administered to respondents, not just the response codes.
| Instrument | Cognitive Reflection Test (7-item) |
|---|---|
| Mean words per item | 33.429 |
| Mean characters per item | 165.429 |
| Mean characters per response | 8 |
| Flesch-Kincaid grade level | 4.961 |
iditemresprttreat
Or load it directly in R or Python:
# R
install.packages("remotes")
remotes::install_github("itemresponsewarehouse/Rpkg")
library(irw)
df <- irw_fetch("knight_2026_crt")
# Python
pip install irw
import irw
df = irw.fetch("knight_2026_crt")
| IRW version | v393 |
|---|---|
| Redivis dataset | item_response_warehouse_3 v7.0 |
| Redivis dataset DOI | 10.57761/pqqn-pm43 |
| Manifest pin for this IRW version | v7.0 |
| Metadata source | irw_meta v23.0 |