condition mean min max ZT0-3 2.07402 2.07402 2.07402 ZT4-7 1.505675 1.505675 1.505675 ZT8-11 0.809809 0.809809 0.809809 ZT12-15 0.8940885 0.8940885 0.8940885 ZT16-19 1.422475 1.422475 1.422475 ZT20-23 2.8959 2.8959 2.8959