Table 1 Summary of study population characteristics.

From: Sex-specific effects of aging on humoral immune responses to repeated influenza vaccination in older adults

 

All

Male

Female

Person-seasons—n (%)

433

192 (44.3)

241 (55.7)

Individuals—n (%)

90

40 (44.4)

50 (55.6)

Yearly participation—n (%)

 2014

45 (50.0)

19 (47.5)

26 (52.0)

 2015

68 (75.6)

28 (70.0)

40 (80.0)

 2016

68 (75.6)

31 (77.5)

37 (74.0)

 2017

87 (96.7)

38 (95.0)

49 (98.0)

 2018

88 (97.8)

40 (100.0)

48 (96.0)

 2019

77 (85.6)

36 (90.0)

41 (82.0)

Number of seasons participated

 4

40 (44.4)

18 (45.0)

22 (44.0)

 5

27 (30.0)

12 (30.0)

15 (30.0)

 6

23 (25.6)

10 (25.0)

13 (26.0)

Birth year—median (p25-p75)

1934 (1930–1938)

1934 (1929–1938)

1934 (1930–1938)

Range

1916–1941

1922–1941

1916–1940

Baseline characteristicsa

Age—Median (p25-p75)

80 (77–83)

80 (77–84)

80 (77–83)

Frailty—n (%)

 Non-frail

37 (41.1)

17 (42.5)

20 (40.0)

 Pre-frail

48 (53.3)

21 (52.5)

27 (54.0)

 Frail

5 (5.6)

2 (5.0)

3 (6.0)

BMI—median (p25-p75)

26.8 (24.5–30.4)

27.0 (25.3–29.6)

26.5 (23.2–30.5)

Change from baselineb

Frailty—n (%)

 Improved

11 (12.2)

8 (20.0)

3 (6.0)

 No change

44 (48.9)

18 (45.0)

26 (52.0)

 Worsened

35 (38.9)

14 (35.0)

21 (42.0)

BMI

 Decreased

39 (43.3)

19 (47.5)

20 (40.0)

 No change (+/−1)

38 (42.2)

14 (35.0)

24 (48.0)

 Increased

13 (14.4)

7 (17.5)

6 (12.0)

  1. aValue for first year participated.
  2. bDifference between first and last year participated.