condition mean min max ZT0-3 163.924364 163.924364 163.924364 ZT4-7 107.269685 107.269685 107.269685 ZT8-11 125.633983 125.633983 125.633983 ZT12-15 184.2666385 184.2666385 184.2666385 ZT16-19 223.397082 223.397082 223.397082 ZT20-23 326.8269345 326.8269345 326.8269345