condition mean min max ZT0-3 2.2267099999999997 2.2267099999999997 2.2267099999999997 ZT4-7 1.5295159999999999 1.5295159999999999 1.5295159999999999 ZT8-11 1.467074 1.467074 1.467074 ZT12-15 2.2535533333333335 2.2535533333333335 2.2535533333333335 ZT16-19 2.15287 2.15287 2.15287 ZT20-23 1.06271 1.06271 1.06271