The OP is calculated and used similarly to the Australian Tertiary Admission Rank (ATAR) in other states. Instead of being a percentile rank (0.00 - 99.95), however, OPs are measured on a scale from 1 to 25, where 1 is the highest and 25 is the lowest. This range of possible results is bell curved so the percentage of students receiving the very highest and very lowest results is much less common than those receiving mid-range OPs. In 2018, 733 students received an OP1, according to Minister for Education Grace Grace. 49.7% of Queensland high school students were eligible to obtain an OP in 2018.