condition mean min max ZT0-3 50.803433 50.803433 50.803433 ZT4-7 40.315436 40.315436 40.315436 ZT8-11 43.9498155 43.9498155 43.9498155 ZT12-15 60.8273455 60.8273455 60.8273455 ZT16-19 98.948403 98.948403 98.948403 ZT20-23 94.039841 94.039841 94.039841