Table 1.

Comparison of 2010 and 2018 National Health Interview Survey (NHIS) and Behavioral Risk Factor Surveillance System (BRFSS) characteristics

	NHIS 2010	NHIS 2018	BRFSS 2010	BRFSS 2018
Jurisdictions included	All 50 states and District of Columbia	All 50 states and District of Columbia	All 50 states, District of Columbia, Puerto Rico, Guam, Virgin Islands	All 50 states, District of Columbia, Puerto Rico, Guam
Interview format	Primarily face-to-face in respondents’ homesa	Primarily face-to-face in respondents’ homesa	Telephone (landline only)	Telephone (landline or cell phone)
Missing hysterectomy status among females aged 20–79 years	7.9%	2.9%	2.7%	5.9%
Reason for missing hysterectomy status	Don’t know: 26 Refused: 73 Not asked: 985	Don’t know: n = 23 Refused: n = 34 Not asked: n = 308	Don’t know: n = 240 Refused: n = 1,195 Not asked: 5,373	Don’t know: n = 397 Refused: n = 615 Not asked: n = 11,652
Weighting system	Post-stratification	Post-stratification	Post-stratification	Iterative proportional fitting (raking)
Level of survey administration	National	National	State or territory	State or territory
Response rate	60.8%	53.1%b	54.6%c	Cell phone: 43.4%d Landline: 53.3%d
Hysterectomy item	“Have you had a hysterectomy?”	“Have you had a hysterectomy?”	“Have you had a hysterectomy?”	“Have you had a hysterectomy?”
Read if necessary	Not applicable	Not applicable	“A hysterectomy is an operation to remove the uterus (womb).”	“A hysterectomy is an operation to remove the uterus (womb).”
Date of hysterectomy	“When was your hysterectomy?”	Not assessed	Not assessed	Not assessed
Type of hysterectomy	Not assessed	Not assessed	Not assessed	Not assessed
Cancer diagnosis status	Site of cancer diagnosis	Site of cancer diagnosis	Site of cancer diagnosis obtained for respondents from 9 states and 1 territory	Site of cancer diagnosis obtained for respondents from 6 states

Additional information can be found at (https://www.cdc.gov/brfss/index.html) and (https://www.cdc.gov/nchs/nhis/index.htm)

^aMost NHIS interviews were initiated through in-person visits, and a subset of respondents completed part of the interview through telephone

^bResponse rate reported as a mean

^cResponse rate reported as a median for all participating states

^dResponse rate reported as a median for all participating states and territories