From: Is having your cell phone the key to happiness, or does it really matter? Evidence from a randomized double-blind study
Positive difference
Negative difference
Time estimate
Cell phone status
N
Possessed and on
44
1.89 (4.70)
0.61 (2.58)
3.07 (1.26)
Possessed and off
46
1.52 (3.11)
-0.15 (3.18)
2.86 (1.33)
Removed
54
1.69 (3.70)
-0.04 (2.47)
2.98 (1.51)