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. 2020 Oct 14;22(10):e19804. doi: 10.2196/19804

Table 2.

The 3×50 contingency table.

Words and phrases Period 1 frequency, n (%) Period 2 frequency, n (%) Period 3 frequency, n (%)
e-cigarettea 3308 (4.30) 13015 (4.96) 6266 (5.65)
cigarette 821 (1.07) 4101 (1.56) 1449 (1.31)
nicotine 1185 (1.54) 2933 (1.12) 740 (0.67)
harm 693 (0.90) 2942 (1.12) 772 (0.70)
smoking 803 (1.04) 2532 (0.96) 701 (0.63)
smoking cessation 812 (1.05) 2692 (1.03) 348 (0.31)
tobacco 460 (0.60) 1837 (0.70) 1098 (0.99)
tar 912 (1.18) 1466 (0.56) 575 (0.52)
problem 292 (0.38) 1181 (0.45) 626 (0.56)
product 297 (0.39) 1017 (0.39) 618 (0.56)
health 298 (0.39) 1119 (0.43) 466 (0.42)
country 116 (0.15) 864 (0.33) 690 (0.62)
market 198 (0.26) 711 (0.27) 576 (0.52)
use 352 (0.46) 861 (0.33) 232 (0.21)
smoker 201 (0.26) 801 (0.31) 327 (0.29)
taste 344 (0.45) 656 (0.25) 255 (0.23)
industry 0 (0.00) 569 (0.22) 616 (0.56)
brand 136 (0.18) 491 (0.19) 594 (0.54)
smog 348 (0.45) 665 (0.25) 0 (0.00)
tradition 143 (0.19) 621 (0.24) 301 (0.27)
America 0 (0.00) 616 (0.23) 303 (0.27)
forbid 124 (0.16) 438 (0.17) 457 (0.41)
cartridge 130 (0.17) 458 (0.17) 402 (0.36)
tar 167 (0.22) 654 (0.25) 0 (0.00)
influence 167 (0.22) 537 (0.20) 246 (0.22)
sale 0 (0.00) 0 (0.00) 601 (0.54)
produce 193 (0.25) 633 (0.24) 193 (0.17)
China 0 (0.00) 515 (0.20) 294 (0.27)
low voltage e-cigarette 172 (0.22) 519 (0.20) 0 (0.00)
body 166 (0.22) 532 (0.20) 0 (0.00)
choice 162 (0.21) 444 (0.17) 201 (0.18)
channel 0 (0.00) 0 (0.00) 624 (0.56)
minor 0 (0.00) 0 (0.00) 562 (0.51)
component 150 (0.19) 489 (0.19) 0 (0.00)
content 159 (0.21) 461 (0.18) 0 (0.00)
burn 137 (0.18) 527 (0.20) 0 (0.00)
research 153 (0.20) 523 (0.20) 0 (0.00)
flavor 176 (0.23) 326 (0.12) 241 (0.22)
atomize 133 (0.17) 479 (0.18) 0 (0.00)
company 0 (0.00) 408 (0.16) 238 (0.21)
supervise 0 (0.00) 343 (0.13) 325 (0.29)
user 0 (0.00) 371 (0.14) 235 (0.21)
addiction 0 (0.00) 406 (0.15) 0 (0.00)
heat 0 (0.00) 465 (0.18) 0 (0.00)
offline 0 (0.00) 0 (0.00) 600 (0.54)
advice 129 (0.17) 0 (0.00) 175 (0.16)
friends 110 (0.14) 327 (0.12) 0 (0.00)
data 0 (0.00) 387 (0.15) 0 (0.00)
atomizer 172 (0.22) 0 (0.00) 0 (0.00)
teenager 0 (0.00) 0 (0.00) 177 (0.16)
sum 76,976 (14.32) 26,2491 (19.8) 11,0895 (20.85)

ae-cigarette: electronic cigarette.