condition mean min max ZT0-3 122.463117 122.463117 122.463117 ZT4-7 291.4683205 291.4683205 291.4683205 ZT8-11 328.73961099999997 328.73961099999997 328.73961099999997 ZT12-15 195.868817 195.868817 195.868817 ZT16-19 133.51371899999998 133.51371899999998 133.51371899999998 ZT20-23 73.517585 73.517585 73.517585