condition mean min max ZT0-3 142.268397 142.268397 142.268397 ZT4-7 114.585982 114.585982 114.585982 ZT8-11 109.35243249999999 109.35243249999999 109.35243249999999 ZT12-15 145.7372745 145.7372745 145.7372745 ZT16-19 140.7564495 140.7564495 140.7564495 ZT20-23 122.85497699999999 122.85497699999999 122.85497699999999