condition mean min max ZT0-3 8.433495 8.433495 8.433495 ZT4-7 11.415809 11.415809 11.415809 ZT8-11 13.2822395 13.2822395 13.2822395 ZT12-15 12.794968 12.794968 12.794968 ZT16-19 10.8745895 10.8745895 10.8745895 ZT20-23 9.6829845 9.6829845 9.6829845