Table:
text: Diving at the 1960 Summer Olympics – Women's 10 metre platform
Results
Results
Rank_ Diver Preliminary_Points Preliminary_Rank Final_Points Final_Rank Final_Total_
1 Ingrid Krämer (EUA) 56.30 1 34.98 2 91.28
2 Paula Jean Myers-Pope (USA) 54.70 2 35.24 1 89.94
3 Ninel Krutova (URS) 53.38 3 33.61 3 86.99
4 Juno Stover-Irwin (USA) 51.90 6 31.69 4 83.59
5 Raisa Gorokhovskaya (URS) 51.53 8 31.50 5 83.03
6 Norma Thomas (GBR) 51.77 7 30.44 7 82.21
7 Nicolle Darrigrand-Pellissard (FRA) 49.68 12 31.50 5 81.18
8 Phyllis Long (GBR) 52.12 5 28.86 9 80.98
9 Irene MacDonald (CAN) 51.31 9 29.18 8 80.49
10 Kumiko Watanabe (JPN) 51.04 10 28.56 10 79.60
11 Kanoko Tsutani-Mabuchi (JPN) 49.76 11 28.14 11 77.90

text: Diving at the 1960 Summer Olympics – Women's 10 metre platform
Results
Results
Rank_ Diver Preliminary_Points Preliminary_Rank Final_Points Final_Rank Final_Total_
12 Birte Christoffersen-Hanson (SWE) 53.03 4 24.40 12 77.43
13 Maria Teresa Adames (MEX) 49.54 13   
14 Hanna Laursen (DEN) 48.89 14   
15 Gabriele Schöpe (EUA) 48.81 15   
16 Bende Velin (DEN) 48.35 16   
17 Laura Conter (ITA) 45.55 17   
18 Susan Knight (AUS) 43.03 18

Question: How many riders competed in the Preliminary Round for Diving at the 1960 Summer Olympics - Women's 10m Platform?