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. 2014 Jun 4;9(6):e98312. doi: 10.1371/journal.pone.0098312

Table 1. Factor analysis for Smartphone Addiction Inventory (SPAI).

No Question Factor loading
Mean(SD) Compulsive behavior Functional impairment Withdrawal Tolerance
7 Although using smartphone has brought negative effects on my interpersonal relationships, the amount of time spent on Internet remains unreduced 1.86(0.69) .837 −.092 −.114 .049
10 I feel distressed or down once I cease using smartphone for a certain period of time 1.73(0.65) .600 −.108 .153 .156
20 My life would be joyless hadn't there been smartphone 1.83(0.73) .570 .121 .082 −.036
18 My recreational activities are reduced due to smartphone use 1.85(0.71) .520 .337 .055 −.114
6 I use smartphone for a longer period of time and spend more money than I had intended 1.91(0.72) .518 .138 −.033 .206
22 I try to spend less time on smartphone, but the efforts were in vain 1.86(0.67) .492 .080 .321 .022
5 I feel very vigorous upon smartphone use regardless of the fatigues experienced 1.92(0.65) .448 .142 −.012 .229
21 Surfing the smartphone has exercised negative effects on my physical health. For example, viewing smartphone when crossing the street; fumbling with one's smartphone while driving or waiting, and resulted in danger 1.90(0.78) .435 .272 .166 −.251
11 I fail to control the impulse to use smartphone 1.89(0.68) .400 .100 .330 .008
13 I feel aches and soreness in the back or eye discomforts due to excessive smartphone use 2.09(0.77) −.143 .830 −.137 .125
26 I feel tired on daytime due to late-night use of smartphone 1.71(0.69) .121 .823 −.018 −.229
23 I make it a habit to use smartphone and the sleep quality and total sleep time decreased 1.98(0.78) .031 .757 .126 −.081
8 I have slept less than four hours due to using smartphone more than once 1.66(0.71) .182 .704 −.405 .059
15 To use smartphone has exercised certain negative effects on my schoolwork or job performance. 1.89(0.66) .073 .535 .183 .011
12 I find myself indulged on the smartphone at the cost of hanging out with friends 1.82(0.68) .464 .466 −.142 .032
17 My interaction with family members is decreased on account of smartphone use 1.78(0.66) .390 .465 −.047 .083
24 I need to spend an increasing amount of time on smartphone to achieve same satisfaction as before 1.84(0.68) .231 .353 .177 .213
4 I feel restless and irritable when the smartphone is unavailable 2.46(0.80) .088 −.247 .810 −.015
2 I feel uneasy once I stop smartphone for a certain period of time 2.18(0.75) .257 −.345 .756 .137
25 I can not have meal without smartphone use 1.96(0.82) .281 −.072 .753 −.318
14 The idea of using smartphone comes as the first thought on mind when waking up each morning 2.56(0.89) −.586 .376 .698 .100
16 I feel missing something after stopping smartphone for a certain period of time 2.22(0.82) −.056 .141 .575 .228
19 I feel the urge to use my smartphone again right after I stopped using it 2.15(0.80) .097 .372 .404 .068
3 I find that I have been hooking on smartphone longer and longer 2.38(0.75) .032 −.086 .087 .867
9 I have increased substantial amount of time using smartphone per week in recent 3 months 2.15(0.80) .092 −.002 −.106 .847
1 I was told more than once that I spent too much time on smartphone. 2.04(0.76) .218 .124 .189 .302