condition mean min max ZT0-3 42.501971 42.501971 42.501971 ZT4-7 77.437588 77.437588 77.437588 ZT8-11 80.17965000000001 80.17965000000001 80.17965000000001 ZT12-15 79.8835225 79.8835225 79.8835225 ZT16-19 53.134509 53.134509 53.134509 ZT20-23 51.617281 51.617281 51.617281