condition mean min max ZT0-3 3065.53626 3065.53626 3065.53626 ZT4-7 3132.013205 3132.013205 3132.013205 ZT8-11 3351.419768 3351.419768 3351.419768 ZT12-15 3183.5202615 3183.5202615 3183.5202615 ZT16-19 2511.7070315 2511.7070315 2511.7070315 ZT20-23 2639.6573955 2639.6573955 2639.6573955