condition mean min max ZT0-3 152.816562 152.816562 152.816562 ZT4-7 150.146026 150.146026 150.146026 ZT8-11 155.0944705 155.0944705 155.0944705 ZT12-15 149.208875 149.208875 149.208875 ZT16-19 154.4009185 154.4009185 154.4009185 ZT20-23 155.33871950000002 155.33871950000002 155.33871950000002