condition mean min max ZT0-3 8.07782 5.927004999999999 9.787455 ZT4-7 5.15436 5.15436 5.15436 ZT8-11 5.14083 5.14083 5.14083 ZT12-15 8.250164999999999 7.99197 8.50836 ZT16-19 7.135565 7.135565 7.135565 ZT20-23 9.50872 9.50872 9.50872