condition mean min max ZT0-3 41.8537 41.8537 41.8537 ZT4-7 34.92845 34.92845 34.92845 ZT8-11 38.53405 38.53405 38.53405 ZT12-15 40.3237 40.3237 40.3237 ZT16-19 38.102850000000004 38.102850000000004 38.102850000000004 ZT20-23 41.2025 41.2025 41.2025