condition mean min max ZT0-3 13.30711 8.32898 16.063950000000002 ZT4-7 10.83395 10.83395 10.83395 ZT8-11 8.491025 8.491025 8.491025 ZT12-15 8.4584825 8.431795000000001 8.48517 ZT16-19 8.20068 8.20068 8.20068 ZT20-23 15.0229 15.0229 15.0229