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Table 1 Characteristics of Incident and Continuing Benzodiazepine Cohorts at Risk of Fall Events

From: Prescription characteristics associated with fall-related injury risk among older adults prescribed benzodiazepines: a cohort study

Characteristic, n (%)

Incident Cohort

N=379,273a

Continuing Cohort

N=509,634b

Sociodemographics

 Sex

  Male

118,036 (31.1)

149,442 (29.3)

  Female

261,237 (68.9)

360,192 (70.7)

Age

 65-74

202,666 (53.4)

283,473 (55.6)

 75-84

119,955 (31.6)

153,270 (30.1)

 85+

56,652 (14.9)

72,891 (14.3)

Racec

 Non-Hispanic White

330,901 (87.2)

447,637 (87.8)

 Non-Hispanic Black

18,783 (5.0)

24,197 (4.7)

 Hispanic

18,881 (5.0)

26,481 (5.2)

 Asian/Pacific Islander

7,446 (2.0)

7,260 (1.4)

 Other

3,262 (0.9)

4,059 (0.8)

Low-income subsidyd

 No

294,854 (77.7)

361,558 (70.9)

 Yes

84,419 (22.3)

148,076 (29.1)

Ruralitye

 Urban

331,191 (87.3)

437,221 (85.8)

 Rural

48,082 (12.7)

72,413 (14.2)

Clinical Characteristics

 Elixhauserf

  0-1

104,851 (27.6)

131,720 (25.8)

  2

66,511 (17.5)

94,097 (18.5)

  3

57,384 (15.1)

81,665 (16.0)

  4

44,194 (11.7)

62,659 (12.3)

  5

32,454 (8.6)

45,360 (8.9)

  6

22,933 (6.0)

31,578 (6.2)

  7

16,251 (4.3)

21,471 (4.2)

  8

11,618 (3.1)

14,598 (2.9)

  9+

23,077 (6.1)

26,486 (5.2)

  Dementia

46,734 (12.3)

60,218 (11.8)

  Osteoarthritis

112,096 (29.6)

156,351 (30.7)

  Stroke

22,986 (6.1)

27,777 (5.5)

  Substance Use Disorder

28,353 (7.5)

49,498 (9.7)

  Urinary incontinence

21,180 (5.6)

28,345 (5.6)

  Antihypertensive

280,960 (74.1)

391,420 (76.8)

  Parkinson’s disease medication

18,582 (4.9)

32,452 (6.4)

Frailtyg

 Not frail

249,705 (65.8)

324,251 (63.6)

 Frail

129,568 (34.2)

185,383 (36.4)

BZD Characteristics

 Medication possession ratio, %

  <0.5

n/a

320,176 (62.8)

  0.5-1

n/a

172,766 (33.9)

  >1

n/a

16,692 (3.3)

Average daily dose, lor-eq mg/day

 <1

110,981 (29.3)

109,554 (21.5)

 1-1.99

165,125 (43.5)

196,560 (38.6)

 2+

103,167 (27.2)

203,520 (39.9)

Days’ supply, days

 <14

144,816 (38.2)

59,415 (11.7)

 14-30

201,315 (53.1)

371,159 (72.8)

 31+

33,142 (8.7)

79,060 (15.5)

Other Medication Use

 Antidepressant

  Never

224,801 (59.3)

243,037 (47.7)

  Former

25,828 (6.8)

42,305 (8.3)

  Current

128,644 (33.9)

224,292 (44.0)

Antiepileptics

 Never

302,869 (79.9)

385,350 (75.6)

 Former

20,517 (5.4)

30,931 (6.1)

 Current

55,887 (14.7)

93,353 (18.3)

Antipsychotics

 Never

348,124 (91.8)

449,619 (88.2)

 Former

8,679 (2.3)

16,107 (3.2)

 Current

22,470 (5.9)

43,908 (8.6)

 Opioids

 Never

237,245 (62.6)

286,972 (56.3)

 Former

66,477 (17.5)

106,963 (21.0)

 Current

75,551 (19.9)

115,699 (22.7)

 Z-drugs

 Never

352,229 (92.9)

464,349 (91.1)

 Former

11,001 (2.9)

19,454 (3.8)

 Current

16,043 (4.2)

25,831 (5.1)

  1. BZD Benzodiazepine, SD Standard deviation, lor-eq Lorazepam-equivalent
  2. a0.9% had fall event; 93.3% censored at 30d after index, 3.4% for loss of coverage, 2.5% for death
  3. b0.7% had fall event; 96.8% censored at 30d after index, 1.7% for loss of coverage, 0.7% for death
  4. cDerived using the Research Triangle Institute race variable; race groups are mutually exclusive
  5. dConsidered present if a given beneficiary was enrolled or eligible in the Part D low-income subsidy for at least one month during the 6-month baseline period
  6. eDerived using beneficiary state and county codes and Rural-Urban Continuum Codes
  7. fExcludes substance use disorders and depression, which were captured separately
  8. gFrailty dichotomized following Kim et al.[36]