UK LLC Profile: Freeze 17 (August 2026)#
Last modified: 24 Sept 2026
Introduction#
For each freeze, UK LLC produces a summary of the demographic characteristics of LPS participants in the UK LLC TRE, including their sex, gender, year of birth (as a proxy for age) and ethnic group. This information is drawn from two sources:
Harmonised LPS demographic variables created by UK LLC.
Demographic information provided by NHS England (NHSE).
Further details on how these demographic summaries are generated, is available on the UK LLC sample and profile page.
UK LLC profile (based on Freeze 17, August 2026)#
All LPS collected sex assigned at birth.
For NHS England, sex was determined using the most recent record from the Personal Demographics Service.
| Sex | LPS data N (%) | NHSE data N (%) | 'Best measure' N (%) |
|---|---|---|---|
| Male | 118,750 (39.0%) | 109,100 (36.6%) | 145,250 (37.8%) |
| Female | 185,400 (61.0%) | 188,950 (63.4%) | 239,300 (62.2%) |
| Total 'known' | 304,150 | 298,050 | 384,550 |
| Missing (% total) | 372,450 (55.0%) | 0 (0.0%) | 292,050 (43.2%) |
| Total sample | 676,600 | 298,050 | 676,600 |
Six LPS collected information about participants’ gender.
NHS England does not provide any gender identification measures.
| Gender | LPS data N (%) | NHSE data N (%) | 'Best Measure' N (%) |
|---|---|---|---|
| Male | 16,600 (26.6%) | N/A | 16,600 (26.6%) |
| Female | 44,800 (71.9%) | N/A | 44,800 (71.9%) |
| Non-binary | 700 (1.1%) | N/A | 700 (1.1%) |
| Prefer to self-define | 250 (0.4%) | N/A | 250 (0.4%) |
| Total 'known' | 62,350 | N/A | 62,350 |
| Missing | 614,250 (90.8%) | N/A | 614,250 (90.8%) |
| Total sample | 676,600 | N/A | 676,600 |
| Period | LPS data N (%) | NHSE data N (%) | 'Best measure' N (%) |
|---|---|---|---|
| Pre-1935 | 7,650 (2.4%) | 6,100 (2.0%) | 7,650 (2.0%) |
| 1936-1945 | 16,700 (5.1%) | 12,900 (4.3%) | 17,450 (4.5%) |
| 1946-1955 | 45,450 (14.0%) | 35,100 (11.8%) | 49,100 (12.6%) |
| 1956-1965 | 70,150 (21.6%) | 53,250 (17.9%) | 78,450 (20.1%) |
| 1966-1975 | 79,450 (24.4%) | 64,200 (21.5%) | 89,150 (22.9%) |
| 1976-1985 | 47,400 (14.6%) | 47,750 (16.0%) | 57,450 (14.7%) |
| 1986-1995 | 45,200 (13.9%) | 50,350 (16.9%) | 59,900 (15.4%) |
| 1996-2005 | 13,450 (4.1%) | 28,050 (9.4%) | 30,500 (7.8%) |
| 2006-2015 | 0 (0.0%) | 250 (0.1%) | 250 (0.1%) |
| Total 'known' | 325,450 | 297,950 | 389,900 |
| Missing | 351,150 (51.9%) | 286,700 (42.4%) | |
| Total sample | 676,600 | 298,050 | 676,600 |
| Ethnicity | LPS data N (%) | NHSE data N (%) | 'Best measure' N (%) |
|---|---|---|---|
| White | 148,000 (85.4%) | 197,050 (89.2%) | 278,000 (89.1%) |
| Black | 3,800 (2.2%) | 3,200 (1.4%) | 5,350 (1.7%) |
| South Asian | 15,000 (8.7%) | 12,100 (5.5%) | 17,550 (5.6%) |
| Other Asian | 2,550 (1.5%) | 2,400 (1.1%) | 3,550 (1.1%) |
| Mixed | 2,750 (1.6%) | 2,550 (1.2%) | 4,300 (1.4%) |
| Other | 1,300 (0.7%) | 3,550 (1.6%) | 3,350 (1.1%) |
| Total 'known' | 173,400 | 220,850 | 312,100 |
| Missing | 503,200 (74.4%) | 77,200 (25.9%) | 364,500 (53.9%) |
| Total Sample | 676,600 | 298,050 | 676,600 |
| Ethnicity | LPS data N (%) | NHSE data N (%) | 'Best measure' N (%) |
|---|---|---|---|
| White | 245,550 (88.0%) | 197,050 (89.2%) | 321,000 (89.1%) |
| All other ethnic groups | 33,600 (12.0%) | 23,750 (10.8%) | 39,300 (10.9%) |
| Total 'known' | 279,150 | 220,800 | 360,300 |
| Missing | 397,450 (58.7%) | 77,250 (25.9%) | 316,300 (46.7%) |
| Total Sample | 676,600 | 298,050 | 676,600 |