condition mean min max ZT0-3 173.62856 173.62856 173.62856 ZT4-7 118.433822 118.433822 118.433822 ZT8-11 165.1395455 165.1395455 165.1395455 ZT12-15 169.633231 169.633231 169.633231 ZT16-19 246.860506 246.860506 246.860506 ZT20-23 270.20072749999997 270.20072749999997 270.20072749999997