condition mean min max ZT0-3 39.935405 39.935405 39.935405 ZT4-7 39.960924500000004 39.960924500000004 39.960924500000004 ZT8-11 45.787239 45.787239 45.787239 ZT12-15 40.0817405 40.0817405 40.0817405 ZT16-19 39.972155 39.972155 39.972155 ZT20-23 49.9623595 49.9623595 49.9623595