Table 2.

Factors affecting fertility

Increased chance of conception

• Woman aged under 30 years

• Previous pregnancy

• Less than three years trying to conceive

• Intercourse occurring during six days before ovulation, particularly two days before ovulation

• Woman's body mass index (BMI) 20-30

• Both partners non-smokers

• Caffeine intake less than two cups of coffee daily

• No use of recreational drugs

Reduced chance of conception

• Women aged over 35 years

• No previous pregnancy

• More than three years trying to conceive

• Intercourse incorrectly timed, not occurring within six days before ovulation

• Woman's BMI < 20 or > 30

• One or both partners smoke

• Caffeine intake more than two cups of coffee daily

• Regular use of recreational drugs