condition mean min max ZT0-3 4928.667731 4928.667731 4928.667731 ZT4-7 4693.5962495 4693.5962495 4693.5962495 ZT8-11 4039.0446405 4039.0446405 4039.0446405 ZT12-15 4434.2591665 4434.2591665 4434.2591665 ZT16-19 3932.19877 3932.19877 3932.19877 ZT20-23 3816.7698600000003 3816.7698600000003 3816.7698600000003