Table 9 Sample relationships of confounding variables and well-being outcomes estimated by unconditional logistic regression

Cold/flu in last month

Headache^a

370

2.50 (1.57- 3.99)

Cold/flu in last month

Down/depressed^b

369

2.38 (1.04- 5.45)

Cold/flu in last month

Tired at school^b

368

2.07 (1.29- 3.32)

Cold/flu in last month

Sore texting thumb^a

368

2.49 (1.31- 4.75)

Woken by cellphone at least weekly

Headache^b

356

4.70 (2.38- 9.29)

Woken by cellphone at least weekly

Headaches^c

356

5.89 (1.89- 18.30)

Woken by cellphone at least weekly

Down/depressed^b

355

2.42 (1.14- 5.12)

Woken by cellphone at least weekly

Tinnitus^b

355

2.46 (1.33- 4.56)

Woken by cellphone at least weekly

Tired during school^d

354

3.49 (1.97- 6.2)

SES^d

Tired during school^a

368

Low

0.40 (0.18, 0.87)

Mid

0.59 (0.34, 1.01)

High

1

SES^d

Tinnitus^c

368

Low

1

Medium

0.17 (0.05, 0.57)

High

0.41 (0.15, 1.08)

Sex

Trouble falling asleep^a

369

Boys

1

Girls

1.97 (1.29, 3.00)

Sex

Wake up in the night^a

369

Boys

1

Girls

1.57 (1.04, 2.38)

Sex

Tired during school^c

368

Boys

1

Girls

0.51 (0.30, 0.88)

Time of light out, per minute after 7 pm

Trouble falling asleep^b

363

1.008 (1.003, 1.012)

Phone location at night

Headache^a

361

Another room

1

By bed

1.95 (1.20, 3.15)

Under pillow

0.98 (0.43, 2.22)

Distance from eyes for bed-texting

Headache^a

0.96 (0.93, 0.99)