condition mean min max ZT0-3 14.036556 14.036556 14.036556 ZT4-7 13.239385 13.239385 13.239385 ZT8-11 13.643466499999999 13.643466499999999 13.643466499999999 ZT12-15 12.908476 12.908476 12.908476 ZT16-19 11.354117 11.354117 11.354117 ZT20-23 12.984095 12.984095 12.984095