condition mean min max ZT0-3 132.422057 132.422057 132.422057 ZT4-7 140.364378 140.364378 140.364378 ZT8-11 169.9985085 169.9985085 169.9985085 ZT12-15 164.1957195 164.1957195 164.1957195 ZT16-19 142.53002750000002 142.53002750000002 142.53002750000002 ZT20-23 83.1587645 83.1587645 83.1587645