Table 2 Age and multivariable-adjusted logistic regression for associations of sun-seeking behaviors with average annual frequency of indoor tanning bed usage during high school/college

Number of times per week spent outdoors in a swimsuit as a teenager

<1

9,270

215

1.00

1.00

140

1.00

1.00

54

1.00

1.00

1

6,323

230

1.49 (1.23–1.79)^*

1.31 (1.00-1.71)

164

1.60 (1.27–2.01) ^*

1.45 (1.06–1.98) ^*

51

1.25 (0.85–1.84)

1.34 (0.79–2.27)

2

10,603

444

1.65 (1.40–1.95) ^*

1.50 (1.19–1.89) ^*

331

1.84 (1.51–2.25) ^*

1.44 (1.09–1.91) ^*

110

1.52 (1.10–2.11) ^*

1.22 (0.76–1.96)

Several

29,759

1,553

1.99 (1.72–2.30) ^*

1.69 (1.38–2.07) ^*

1,304

2.48 (2.08–2.96) ^*

2.01 (1.58–2.55) ^*

578

2.70 (2.04–3.58) ^*

2.45 (1.65–3.64) ^*

Daily

10,133

559

2.07 (1.77–2.44) ^*

1.80 (1.43–2.26) ^*

523

2.87 (2.37–3.47) ^*

2.25 (1.73–2.93) ^*

276

3.71 (2.76–4.98) ^*

2.68 (1.76–4.09) ^*

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

100

950

34

1.00

1.00

20

1.00

1.00

18

1.00

1.00

75

2,575

127

1.29 (0.88–1.90)

1.16 (0.68–1.96)

92

1.56 (0.95–2.55)

2.23 (1.05–4.76) ^*

44

0.81 (0.46–1.41)

0.63 (0.29–1.38)

50

6,296

317

1.34 (0.93–1.92)

1.09 (0.67–1.78)

270

1.91 (1.20–3.02) ^*

2.39 (1.16–4.92) ^*

101

0.78 (0.47–1.30)

0.66 (0.33–1.33)

25

14,310

871

1.67 (1.18–2.37) ^*

1.42 (0.89–2.27)

660

2.14 (1.37–3.37) ^*

2.43 (1.19–4.95) ^*

266

0.96 (0.59–1.56)

0.88 (0.46–1.70)

0

40,614

1,646

1.31 (0.93–1.85)

1.07 (0.67–1.71)

1,412

2.03 (1.30–3.17) ^*

2.29 (1.13–4.64) ^*

635

1.11 (0.69–1.78)

0.88 (0.46–1.69)

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

<1

5,574

142

1.00

1.00

76

1.00

1.00

33

1.00

1.00

2–4

24,162

1,013

1.53 (1.28–1.83) ^*

1.59 (1.23–2.06) ^*

655

1.80 (1.42–2.29) ^*

1.86 (1.31–2.65) ^*

222

1.36 (0.94–1.96)

1.12 (0.70–1.81)

≥5

43,564

2,221

1.76 (1.48–2.09) ^*

1.59 (1.24–2.04) ^*

2,033

2.89 (2.29–3.64) ^*

2.83 (2.01–3.98) ^*

958

2.96 (2.09–4.20) ^*

2.18 (1.39–3.44) ^*

Number of severe sunburns that blistered between ages 15–20

Never

26,144

911

1.00

1.00

784

1.00

1.00

341

1.00

1.00

1–2

28,317

1,444

1.45 (1.33–1.58) ^*

1.42 (1.25–1.62) ^*

1,161

1.35 (1.23–1.48) ^*

1.24 (1.08–1.42) ^*

490

1.31 (1.14–1.50) ^*

1.03 (0.84–1.26)

3–4

12,289

656

1.56 (1.41–1.73) ^*

1.57 (1.35–1.82) ^*

492

1.36 (1.22–1.53) ^*

1.27 (1.08–1.51) ^*

211

1.36 (1.14–1.61) ^*

1.10 (0.87–1.41)

5–9

5,374

280

1.55 (1.35–1.77) ^*

1.49 (1.22–1.81) ^*

251

1.63 (1.41–1.88) ^*

1.48 (1.20–1.82) ^*

119

1.81 (1.46–2.23) ^*

1.39 (1.04–1.87) ^*

≥10

1,803

98

1.61 (1.30-2.00) ^*

1.64 (1.24–2.15) ^*

92

1.78 (1.43–2.23) ^*

1.72 (1.30–2.29) ^*

62

2.82 (2.14–3.72) ^*

2.18 (1.53–3.10) ^*