condition mean min max ZT0-3 217.695505 217.695505 217.695505 ZT4-7 238.3589025 238.3589025 238.3589025 ZT8-11 284.914831 284.914831 284.914831 ZT12-15 290.157666 290.157666 290.157666 ZT16-19 284.145002 284.145002 284.145002 ZT20-23 178.4723565 178.4723565 178.4723565