Characteristic	Treated	Untreated
Number of women	33 519	10 628
Monash IVF Cancer database	3085	4267
Monash IVF registry	30 434	6361
Age (years)
At entry, median (IQR)	34 (31–38)	33 (29–37)
At follow‐up, median (IQR)	49 (44–56)	59 (50–65)
< 40 years	3868 (11.5%)	609 (5.7%)
40–49 years	14 126 (42.1%)	1935 (18.2%)
50–59 years	10 831 (32.3%)	3321 (31.2%)
60–69 years	4030 (12.0%)	4024 (37.9%)
> 70 years	664 (2.0%)	739 (7.0%)
Aetiology
Aetiology recorded	20 428 (60.9%)	6018 (56.6%)
Unexplained	5453 [26.7%]	1781 [29.6%]
Tubal	4274 [20.9%]	2112 [35.1%]
Endometrial	2402 [11.8%]	462 [7.7%]
Ovarian	2139 [10.5%]	378 [6.3%]
Multiple factors	3045 [14.9%]	140 [2.3%]
Male factor	1534 [7.5%]	1036 [17.2%]
Other	1581 [7.7%]	109 [1.8%]
No aetiology recorded	13 091 (39.1%)	4610 (43.4%)
Stimulated cycles, median (IQR)	2 (1–4)	—
1 or 2	17 412 (51.9%)	—
3 or more	16 107 (48.1%)	—
Oocytes/cycle, median (IQR)	7.0 (3–11)	—
1–5	12 913 (38.5%)	—
6 or more	17 470 (52.1%)	—
Missing data	3136 (9.4%)	—
Fertility drug type †
Follicle‐stimulating hormone	29 637 (88.4%)	—
Hormone replacement therapy	6267 (18.7%)	—
Clomiphene citrate	2419 (7.2%)	—
Unknown	3068 (9.1%)	—

IQR = interquartile range.

^*Excludes two women (one in each group) for whom registration dates were not reliable.

^†Women who have ever been treated with drug combination; multiple treatments possible.