condition mean min max ZT0-3 37.682375140000005 32.36191933 43.00283095 ZT4-7 17.6664623625 16.05094405 19.281980675 ZT8-11 19.525257585 16.349674880000002 22.70084029 ZT12-15 20.080083385000002 20.037657525 20.122509245 ZT16-19 24.8537656525 23.93988858 25.767642725 ZT20-23 29.908127880000002 27.862362345 31.953893415