Table 3 Age and multivariable-adjusted linear regression for associations of sun-seeking behaviors with average annual frequency of indoor tanning bed usage during high school/college

Weekly time spent outdoors in a swimsuit as a teenager

<1

9,679

1.00

1.00

1

6,768

0.07 (-0.01-0.16)

0.05 (-0.07-0.17)

2

11,488

0.13 (0.05–0.20)^*

0.03 (-0.08-0.13)

Several

33,194

0.50 (0.42–0.57)^*

0.32 (0.21–0.43)^*

Daily

11,491

0.32 (0.26–0.38)^*

0.25 (0.16–0.34)^*

Percentage of time wearing sunscreen at the pool or beach as a teenager

100

1,022

1.00

1.00

75

2,838

-0.002 (-0.20-0.19)

-0.07 (-0.35-0.21)

50

6,984

0.03 (-0.15-0.21)

-0.02 (-0.28-0.23)

25

16,107

0.12 (-0.05-0.30)

0.08 (-0.16-0.33)

0

44,307

0.13 (-0.04-0.30)

0.03 (-0.21-0.27)

Weekly hours spent outdoors in direct sunlight during the day during high school/college

<1

5,825

1.00

1.00

2–4

26,052

0.09 (0.01–0.17)^*

0.07 (-0.04-0.18)

≥5

48,776

0.39 (0.31–0.46)^*

0.29 (0.18–0.40)^*

Number of severe sunburns that blistered between ages 15–20

Never

28,180

1.00

1.00

1–2

31,412

0.13 (0.09–0.18)^*

0.01 (-0.05-0.08)

3–4

13,648

0.15 (0.10–0.21)^*

0.06 (-0.02-0.15)

5–9

6,024

0.29 (0.21–0.37)^*

0.17 (0.06–0.28)^*

≥10

2,055

0.53 (0.41–0.66)^*

0.45 (0.29–0.62)^*