condition mean min max ZT0-3 7.21949 6.885465 7.553515 ZT4-7 6.945365000000001 6.945365000000001 6.945365000000001 ZT8-11 9.962605 9.962605 9.962605 ZT12-15 0 0 0 ZT16-19 11.1317 11.1317 11.1317 ZT20-23 9.34104 9.34104 9.34104