| # | Searches | Results |
| 1 | Fertility/or Menstrual Cycle/ | 57,848 |
| 2 | (menstru* or “period track*” or fertility).kf,tw. | 158,304 |
| 3 | 1 or 2 | 177,575 |
| 4 | Smartphone/ or Mobile Applications/ | 58,337 |
| 5 | (tracker* or tracking or app or apps).kf,tw. | 156,438 |
| 6 | 4 or 5 | 165,751 |
| 7 | 3 and 6 | 543 |
| 8 | limit 7 to animals | 84 |
| 9 | 7 not 8 | 459 |
| 10 | limit 9 to yr = “2010–Current” | 388 |
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