Table 1.
Top 50 Keywords (N=9,782)
| Rank | Total (N=9,782) | Online newspaper articles (n=5,451) | SNS (n=5,304) | |||
|---|---|---|---|---|---|---|
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| Keyword | TF-IDF | Keyword | TF-IDF | Keyword | TF-IDF | |
| 1 | Yirundung-yi | 2,132.5 | Yirundung-yi | 824.2 | Yirundung-yi | 1,262.5 |
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| 2 | Premature infant | 1,660.2 | Premature infant | 626.0 | Premature infant | 906.8 |
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| 3 | Premature infant formula | 1,041.0 | Newborn | 416.8 | Premature infant formula | 849.7 |
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| 4 | Infant | 988.9 | Medipost Pneumostem®* | 404.3 | Naturemade®† | 810.1 |
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| 5 | Naturemade®† | 987.0 | Daughter | 360.5 | Infant | 714.8 |
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| 6 | Child | 817.2 | Under | 336.5 | Powdered milk | 574.3 |
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| 7 | Newborn | 722.6 | NICU | 324.5 | Give | 505.5 |
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| 8 | Powdered milk | 706.4 | Child | 322.4 | Baby | 504.6 |
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| 9 | Hospital | 646.3 | Born | 306.8 | Discharge | 497.1 |
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| 10 | Discharge | 631.0 | Pregnancy | 298.3 | Child | 494.3 |
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| 11 | Baby | 611.0 | Incubator | 289.0 | Yirundung-yi mom | 474.1 |
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| 12 | Give | 609.3 | ROP | 277.2 | Hospital | 402.5 |
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| 13 | Huggies® | 601.3 | Support | 275.9 | Weight | 361.6 |
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| 14 | Incubator | 584.2 | BPD | 257.4 | Huggies® | 348.7 |
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| 15 | Daughter | 574.6 | Particulate matter | 254.5 | Need | 323.8 |
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| 16 | Yirundung-yi mom | 564.1 | Huggies® | 253.5 | Delivery | 322.8 |
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| 17 | Childbirth | 533.5 | Congenital anomaly | 252.8 | Breast milk | 314.3 |
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| 18 | Medipost Pneumostem®* | 524.7 | Hospital | 243.9 | Degree | 310.1 |
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| 19 | Under | 515.7 | Danger | 241.9 | Babe | 305.8 |
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| 20 | Weight | 505.3 | Voucher | 232.9 | Sale | 298.7 |
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| 21 | NICU | 500.9 | Infant | 224.4 | Postnatal care center | 286.4 |
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| 22 | Birth | 488.4 | Treatment | 221.5 | Mother | 286.1 |
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| 23 | Need | 478.0 | Pregnant woman | 219.2 | Height | 280.8 |
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| 24 | Pregnancy | 466.7 | Person | 216.3 | Preemie | 280.0 |
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| 25 | Mother | 464.0 | Delivery | 210.8 | Incubator | 274,4 |
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| 26 | Support | 454.7 | Body weight | 205.3 | Recommendation | 270.6 |
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| 27 | Breast milk | 397.6 | Diaper | 202.2 | Nicu | 266.9 |
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| 28 | Degree | 377.8 | Yuhan-Kimberly | 202.2 | ROP | 261.5 |
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| 29 | Body weight | 364.4 | Selection | 195.0 | Worry | 258.0 |
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| 30 | ROP | 364.4 | Health | 193.0 | Birth | 253.5 |
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| 31 | Congenital anomaly | 361.8 | Region | 188.4 | Completion | 252.7 |
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| 32 | Sale | 358.1 | Medical expenses support | 183.4 | Test | 250.3 |
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| 33 | Delivery | 356.0 | Campaign | 181.8 | Mom | 248.9 |
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| 34 | Health | 354.9 | Extreme prematurity | 181.8 | Corrected | 235.1 |
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| 35 | Babe | 352.0 | Mother | 177.9 | Twin | 231.3 |
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| 36 | Twin | 350.5 | Parent | 175.2 | Thinking | 228.4 |
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| 37 | Particulate matter | 339.3 | Hospital bills | 173.2 | Infant formula | 215.5 |
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| 38 | Height | 338.6 | Hold | 170.6 | University hospital | 212.4 |
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| 39 | Treatment | 337.2 | Surgery | 168.4 | Newborn | 210.4 |
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| 40 | BPD | 334.1 | Ministry of Health and Welfare | 168.1 | Small | 205.2 |
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| 41 | Danger | 330.3 | Outbreak | 167.4 | Request | 203.4 |
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| 42 | Postnatal care center | 329.0 | Doctor | 166.6 | Home | 202.4 |
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| 43 | Premature retina | 323.8 | World | 159.0 | Hospitalization | 201.3 |
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| 44 | Surgery | 323.0 | Puerperal mother | 158.7 | ROP test | 196.2 |
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| 45 | Preemie | 318.6 | Child Fund Korea | 156.3 | Collect on delivery | 192.5 |
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| 46 | Person | 315.9 | Case | 155.3 | Use | 190.9 |
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| 47 | Worry | 311.6 | This year | 153.0 | Agonize | 188.3 |
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| 48 | Recommendation | 308.2 | Need | 151.9 | Post | 180.9 |
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| 49 | Voucher | 306.9 | The latest | 149.8 | Premature birth | 179.2 |
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| 50 | Nicu | 306.9 | Last year | 147.2 | Corrected age | 171.4 |
*
A medication for preventing and treating bronchopulmonary dysplasia in clinical trials in South Korea;
†
A diaper brand name in South Korea;
BPD, bronchopulmonary dysplasia; NICU, neonatal intensive care unit; ROP, retinopathy of prematurity; SNS, social networking service; TF-IDF, term frequency-inverse document frequency.