condition mean min max ZT0-3 11.240545 11.240545 11.240545 ZT4-7 15.433811 15.433811 15.433811 ZT8-11 13.156788500000001 13.156788500000001 13.156788500000001 ZT12-15 14.1188295 14.1188295 14.1188295 ZT16-19 12.3244945 12.3244945 12.3244945 ZT20-23 12.4647065 12.4647065 12.4647065