condition mean min max ZT0-3 34.500556 34.500556 34.500556 ZT4-7 36.4895565 36.4895565 36.4895565 ZT8-11 39.1236015 39.1236015 39.1236015 ZT12-15 40.013909999999996 40.013909999999996 40.013909999999996 ZT16-19 44.264904 44.264904 44.264904 ZT20-23 41.3801725 41.3801725 41.3801725