condition mean min max ZT0-3 54.882766 54.882766 54.882766 ZT4-7 68.5838305 68.5838305 68.5838305 ZT8-11 74.075626 74.075626 74.075626 ZT12-15 86.5123655 86.5123655 86.5123655 ZT16-19 69.288908 69.288908 69.288908 ZT20-23 58.145925 58.145925 58.145925