| # | Searches | Results |
| 1 | female fertility/or menstrual cycle/ | 53,990 |
| 2 | (menstru* or “period track*” or fertility).kf,tw. | 193,189 |
| 3 | 1 or 2 | 210,381 |
| 4 | mobile phone/or smartphone/or mobile application/ | 60,818 |
| 5 | (tracker* or tracking or app or apps).kf,tw. | 216,193 |
| 6 | 4 or 5 | 259,941 |
| 7 | 3 and 6 | 1106 |
| 8 | limit 7 to embase | 538 |
| 9 | limit 8 to yr = “2010–Current” | 461 |
| 10 | limit 9 to animals | 36 |
| 11 | 9 not 10 | 425 |
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