BMD Spine Scan (CT+OS)
| File Name | Data as of | Population | Data collected | One row per | Rows |
|---|---|---|---|---|---|
| bmd_spine_ctos_inv.dat | 9/12/2005 | CT+OS | Baseline, Main | Bone Density Scan | 39,839 |
ID - WHI Participant Common ID Col 1
SPNDAYS - Spine scan days from randomization/enrollment Col 2
SPNVTYP - Spine scan visit type Col 3
SPNVY - Spine scan visit year Col 4 Visit year for which this BMD scan was collected.
SPNVCLO - Closest to visit within visit type and year Col 5 For forms entered with the same visit type and year, indicates the one closest to that visit's target date. Valid for forms entered with an annual visit type. Usage Notes: See data preparation document.
SPNEXPC - Expected for visit Col 6 Was data expected to be collected at this visit? Usage Notes: This includes forms from the subsample of OS participants at year 6 that were enrolled in the three clinical centers participating in the WHI Osteoporosis sub study, as height and weight were collected on OS participants at year 6 by design; see table 16.1; on page 16-18b of volume 2.
SPNAREA - Area of the Total Spine (cm squared) Col 7 Usage Notes: Total spine includes all valid vertebrae from L2, L3 and L4.
SPNBMC - BMC of the Total Spine (grams) Col 8 Usage Notes: Total spine includes all valid vertebrae from L2, L3 and L4.
SPNBMD - BMD of the Total Spine (g/cm squared) Col 9 Usage Notes: Total spine includes all valid vertebrae from L2, L3 and L4.
SPNBMDCOR - BMD of the Total Spine (corrected) (g/cm sq) Col 10 Usage Notes: Corrected BMD value is based on recommendations from the UCSF quality assurance report. For details see the Data Preparation document. Total spine includes all valid vertebrae from L2, L3 and L4 but may not include all three.
SPNBMDL2L4 - Total spine BMD (L2,L3,L4 BMD values are known) (g/cm sq) Col 11 Usage Notes: Corrected BMD value for scans where L2, L3 and L4 BMD are all known. Otherwise set to missing. Corrections are based on recommendations from the UCSF quality assurance report. For details see the Data Preparation document.
SPNTSCOR - Spine (L2-L4) BMD T-score Col 12 Spine (L2-L4) BMD T-score Usage Notes: The T-score represents the number of standard deviations the participant's BMD is above or below the mean for a healthy 30 year old woman of the same race/ethnicity. Based on SPNBMDCOR "BMD of the Total Spine (corrected)".
SPNL2AREA - Area of the L2 (cm squared) Col 13
SPNL2BMC - BMC of the L2 (grams) Col 14
SPNL2BMD - BMD of the L2 (g/cm squared) Col 15
SPNL3AREA - Area of the L3 (cm squared) Col 16
SPNL3BMC - BMC of the L3 (grams) Col 17
SPNL3BMD - BMD of the L3 (g/cm squared) Col 18
SPNL4AREA - Area of the L4 (cm squared) Col 19
SPNL4BMC - BMC of the L4 (grams) Col 20
SPNL4BMD - BMD of the L4 (g/cm squared) Col 21
SPNQDR - QDR serial number of spine scanner Col 22
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BMD summary: Bone Density measurements were collected on a subsample of 11,020 participants at three clinical sites (see the subsample definitions on the previous WHI Data on this site). See the 2005 progress report for a summary of bone mineral density analysis, including percent change from baseline; see page 2-6 for HT table, page 3-13 for DM, page 4-3 for CaD, and page 5-2 for OS. For the standardized procedures for performing the measurements, see Vol. 6 – DXA Quality Assurance of the WHI (1993-2005) manuals under the Documentation tab.